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50b9181791b7bf7b5ae23e0ccf5aca2c | a 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. calculate the percentage composition of the compound by weight. | askiitians.com | 2021.43 | [
{
"text": "dear student boron and oxygen compound → boron + oxygen 0.24 g → 0:096g + 0.144g percentage composition of the compound for boron: 0.24g → 0.096 g 100 g → ? 100 x 0.096 0.24 = 40 % for oxygen: 0.24 g → 0.144 g of oxygen 100 g → ? 100 x 0.144 0.24 = 60% thanks",
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|
d62b404fc9666f82fe541ad6bb859644 | i got air 2044 in jee adv and 382 in bitsat. my first preference is a career in programming. i was advised to join a good iit in any branch and study the things on my own. another choice is to join bits pilani with electrical and upgrade to cse because honestly i.feel my chances to upgrade to cse at a good iit are pretty thin. another option that i had in mind was to join engineering physics as the branch interests me. so if anybody can tell me the actual placements of this branch, which are not for programming. also i`d like an overall suggestion as to what i should do? | askiitians.com | 2021.21 | [
{
"text": "it is a pretty tough call and complex too. the bits option sounds possible.",
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|
24ade57dd5fd0e5796f26547d110e05e | which c-cl bond is weaker.a: ph-(cl-ch)-ch3b: ph-ch2-ch2-cl | askiitians.com | 2021.25 | [
{
"text": "(a) ph-(cl-ch)-ch3 (b) ph-ch2-ch2-cl first one i.e. case a here if the cl leave the place the cation will be stable by resonace whereas the in case be cation will face -i effect of benzene, thus reducing the stablity of cation",
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|
a287e38b5e1247474ff953dfbaf242bd | the maximum displacement of a vibrating body on either side of its mean position, is known as its (a) frequency (b) loudness (c) amplitude (d) pitch | askiitians.com | 2021.21 | [
{
"text": "(c)",
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}
] |
|
38a73942bfd196f1c12e7720e5094b65 | in the circuit given in the figure the initial value of current through the battery on closing the circuit(i.e. k is pressed) is ans: 0.3 a can you please explain how? | askiitians.com | 2021.39 | [
{
"text": "dear siddarth you did not include figure.please include figure and ask again. please feel free to post as many doubts on our discussion forum as you can.we will get you the answer and detailed solution very quickly. all the best. regards, askiitians experts prudhvi teja now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian.",
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|
8687b0fdcdb720235884af0aea76e391 | a gas turbine operating on brayton cycle has the maximum temperature of 1200k and the minimum temperature of 300k. the cycle efficiency for the maximum work capacity will be | askiitians.com | 2021.31 | [
{
"text": "hello, maxmimum efficiency = 1-t min/t max =1-300/1200 =75% so the efficeiency for the maximum work capacity will be 75% and the minimum capaciry will be 25% thank you",
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] |
|
7c18cf23cd6a9621dd61a57ce332c670 | how to prepare for iit to get a rank below 500 | askiitians.com | 2021.21 | [
{
"text": "don't study targetting a particular rank. make the basic concepts clear, work out a lot of jee type problems, do not do problems for the sake of doing it. work out the past 10 yrs jee paper. take mock tests, evaluate yourself frequently. if you feel you're weak in a particular chapter. study the basic concepts of the chapter again. brush up numerical skills. work on your concepts,,,,,,,,,,,,,jee result is determined by your long effort,,,it is not one or two day thing,,, regular study is neccessary,,,,,, targeting rank is foolishness,,,,,,work for your betterment ,your result ,,,,,,,,,,,,,,,",
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39489c497845baa743111c3cf1ec4693 | 2 bromo benzoic acid is more acidic than 2 chloro benzoic acid.explain... | askiitians.com | 2021.25 | [
{
"text": "2 bromobenzene has bromine in ortho position and 2chloro benzene has chlorine in orthoposition therefore there will be hydrogen bond between h and cl in 2chloro benzene and hydrogen bond between h and br in 2 bromobenzene . cl has more electronegativity than br. 2chloro benzene has stronger hydrogen bond due to more electronegativity therefore it requires more temperature to break h + ion than in 2 bromobenzene.since proton donor is acid therfore 2 bromo benzoic acid is more acidic than 2 chloro benzoic acid",
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b55815b3ca1c9451d9c204f2d61c3d77 | sir, while filling the application form for bitsat2010 i mistakenly forgot to take out the printout of the application form and the choice sheet required to be send to the institute along with the demand draft. i filled it online and confirmed it so i cannot open it again please anybody tell me what should i do. i am in deep distress. | askiitians.com | 2021.25 | [
{
"text": "first of all stop getting into distress,, call the institute and tell them what you have done. there must be something for this. tommorow is monday call on 01596-242205 and tell them about this... call around at 10-11 am did you go here? http://www.bitsadmission.com/adquery/adquery.asp please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. do approve if the answer helps you. regards, askiitians experts rahul- iit roorkee",
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},
{
"text": "dear mansi, dont worry much as it will not help you! you must have got some user id or some id after the registration.. do mail to the official id of the bits pilani and also call them on no. given on bits pilani official website. please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. askiitians expert amit yadav now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian.",
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1437b535b9b841f4ecefd69ed62dc644 | <p>is meron and arihant enough for differential calculus and integral calculus?</p> | askiitians.com | 2021.21 | [
{
"text": "i hope the query is resolved",
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] |
|
82d8d139dd79bb115d8aadb4bd84c35b | are we allowed to use scale,compass and protractor in iit jee and other exams as we can draw accurate graphs with it ???? | askiitians.com | 2021.31 | [
{
"text": "dear mir yes you can take these things in exam...but there is no need to draw accurate graphs in the exam. all the best. akash goyal askiitiansexpert-iitd please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar..",
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19b395b0cf75bb8a61a56d61957877f4 | how we can make mechanicseasy | askiitians.com | 2021.25 | [
{
"text": "dear raghavendra, mechanics is easy,first start wwith vectors, understand the topic carefullu read each and every point, you should know how each conclusion came.next thing practise as many problems as you can , dont just read but practise. after doing problems in vectors start with basic kinematics , free body diagrams , newton laws of motion if you do these things properly, mechanics is cake walk. please feel free to ask your queries here. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar.. askiitians expert suryakanth –iitb",
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84f6a53185a76b4eaf7fc675c38acc0f | light multiple choice questions and answers question 17. you are given three media a, b and c of refractive index 1.33, 1.65 and 1.46. the medium in which the light will travel fastest is (a) a (b) b (c) c (d) equal in all three media | askiitians.com | 2021.31 | [
{
"text": "answer: b",
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] |
|
fd6180bf207032c1421aba8e5c30268e | short circuit of battery questions? where does resistances get short circuited? | askiitians.com | 2021.31 | [
{
"text": "@ rajashree what u need to understand in the case of short circuit is that – when a current in a circuit takes unintended path then its called short circuit . for example – suppose the two terminals of the bulb are connected and the bulb doesnot glow and also the torch doesnot work , that is shortcircuiting . generally , during short circuit , the high current flow along the path of reisisters than its maximum limit . so, its damamged . for example – in case suppose u have 2 path , one have total resi. of 10 ohm and anthor have 4 ohm , then all current will flow through 4 ohm resister . that is the thing happeing during short circuit . hope it claers your doubt all the best ..",
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{
"text": "when a short circuit occurs, electrical current experiences little or no resistance because its path has been diverted from its normal direction of flow. this, in turn, produces excess heat and can damage or destroy an electrical appliance. it can also create a fire hazard and an electrical shock hazard if left unattended. a short circuit happens when part of a wire carrying electricity touches another part of circuit or other conductive material, thus giving electricity a pathway which offers less resistance than the circuit is designed to handle. for example, if a wire becomes exposed & touches metal frame of a device, current can flow along the outside causing potential for injury and death if someone touches charged device. a short circuit provides electricity with a shorter path to ground or to equalize electrical potential across two terminals. less distance means less resistance , thus producing more heat which can cause fire. to protect against short circuits, all materials and conductors in electrical equipment must be maintained regularly; wires must never be bent tightly or crimped as cord can easily fray. no circuit can be overloaded. short circuit is a low-resistance connection between two points in an electrical circuit through which current tends to flow rather than along intended path. short circuit is an abnormal condition of relatively low resistance between two points of differing potential in a circuit, resulting in a flow of excess current.",
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|
c68f5d7aac8a29746fce65bcd4b4062d | which of the following amino acids is present only in bacteria and bga? glutamic acid diaminopimetic acid glycine tyrosine do explain your answer. | askiitians.com | 2021.43 | [
{
"text": "dear student the amino acids only in bacteria and blue green algae are methionine, diaminopimelic, aspartic acid, glutamic acid. so, a would be he correct ans hope this helps good luck",
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bd7e44e5c8857a6f973b0bf4d1544dda | two liquids a and b at temperatures 75 celcius and 15 celcius their masses are in ratio 2:3 and their specific heat in ratio 3:4 .what is their resulting temperature ? | askiitians.com | 2021.21 | [
{
"text": "let the final temperature of mixture be t.. a/q, m a .s a .(75-t)=m b .s b .(t-15) m a /m b .s a /s b . (75-t)=(t-15) on putting the values we get t = 35 0 c. thanks and regards adarsh",
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|
f91a4ba1ba7598e8d8f7183e7ba844b5 | in the given arangenent all the surfaces are smooth what acceleration should should be given to the system | askiitians.com | 2021.31 | [
{
"text": "dear student, please give the arrangement",
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}
] |
|
7a2564bb1c9083c1ea575475cdf60969 | assertion : prothallus of red algae are photosynthetic in greater depth of oceans reason : red algae have r phycoerythrin , chl.a and d | askiitians.com | 2021.25 | [
{
"text": "d as prothallus is not found in red algae it is found in pteridophyta. so assertion is incorrect.. regards...radha",
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|
f098996aa727c31a1487720adb3191da | the domain of f(x) is (0,1) therefore the domain of y=f(e^x)+f(ln(x)) is | askiitians.com | 2021.31 | [
{
"text": "dear student i means 0 solveboth the inequalities regards. arun (askiitians forum expert)",
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}
] |
|
98382e5b3befa3e7c76f701da0ca2347 | my rank is 5125 in eml can i get btech in aviation in iist | askiitians.com | 2021.31 | [
{
"text": "dear vicky, total no of seats is just about 2000. you might not even get a branch there. thank you.",
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"is_accepted": false
},
{
"text": "i think so",
"name": "",
"is_accepted": false
},
{
"text": "huojojoj",
"name": "",
"is_accepted": false
},
{
"text": "dear vicky, total seat is just 2000. if most of the people dont show up for counselling you can only hope for it. thank you.",
"name": "",
"is_accepted": false
},
{
"text": "dear vicky, total no. of seats through eml counselling is only 2000 for which students who do not get any seat through iit counselling are also eligible ( around 1000 ) . so sory to state you that you wont be getting any college through this. thank you.",
"name": "",
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}
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|
af7c66f3d0fcb459f73d454e076c02bc | why we can select any of the two sets of direction cosines | askiitians.com | 2021.21 | [
{
"text": "direction cosines are actually the cosine of angles taking between the line and the axes. and the sum of square of the cosines always equals to 1.",
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fe7e83d4b1fe772bae2b63dfacd06dcb | which books would be better for objective pcb? ncert gear up or mtg fingertips which one should i by for pcb? | askiitians.com | 2021.25 | [
{
"text": "for chemistry follow cengauge chemistry for neet and for organic follow organic for doctor by dhusant kumar ( tricks book) and if possible follow askiitians study material solve as many mcq as you can grab that help you to gain confidence. hope it helps..",
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"text": "for biology mrg fingertips is good option as it's is mostly ncert based. for physics go for either hc verma or dc pandey",
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|
2a29054206c5b57a0b3a53596d686d82 | integral sin{lim(t tends to 0)(2x/pie)cot(inverse)(x/t*t)} take limit from -pie/2 to pie/2 | askiitians.com | 2021.25 | [
{
"text": "ans:0 thanks & regards jitender singh iit delhi askiitians faculty",
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|
16a453f51ad1e9f464665f74ddcce1ba | a certain amount of cahrge q is to be divided into two parts q and q-q. these charges are placed at a certain distance so that there is maximum repulsion. how is q and q related? | askiitians.com | 2021.39 | [
{
"text": "dear student let parts are sepereted at a distance of d so repulsion force f= k q(q-q)/d 2 here q and d are constant so for maximum force differentiate the force w.r.t q df/dq = k/d 2 [q -2q] for maximum force df/dq=0 q-2q=0 q/q =2 regards arun (askiitians forum expert)",
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3fa4e15e6cd997615dba4a3b3b074ab4 | plz solve this qustion with deep solutions i need for exam thia qustion | askiitians.com | 2021.25 | [
{
"text": "the question is referring to radioactive equilibrium, hence option c is correct",
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2eaceaec136e23fba8d9de76524d0319 | sir is bits a better choice for career rather than other top engineering colleges. and also say me the tips to score 400+ marks in bitsat and which book to follow. and is arihant publications book for bitsat is good or not. | askiitians.com | 2021.43 | [
{
"text": "please say it in english",
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{
"text": "for sure yes bits is one of the reputed institutions,but there are some other as well in the competition queue,you can visist the official websites of these and compare the features with bits and then decide where you wish to join – shri shankracharaya tech.inst.bhilai lovely professional uni, phagwara banasthali uni, banasthali college of engg, trivandrum",
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|
262f686060769d324ffa500222c165c6 | find the equation of the tangent to the curve y = (x - 7)/{(x-2)(x-3)} at the point where it cuts the x - axis. | askiitians.com | 2021.25 | [
{
"text": "dear y= (x - 7)/{(x-2)(x-3)} for sut point on x axis put y=0 x=7 so point is (7,0) now dy/dx = [(x-2)(x-3) - (x-7)(2x-5)]/ {(x-2)(x-3)} 2 = 1/20 at (7,0) so euation of tangent y-0 = 1/20 (x-7) x-20y -7=0 please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best. regards, askiitians experts badiuddin",
"name": "",
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|
6b05d59707b83c7ccefddc76f43eaff2 | consider two particles executing shms which has the same amplitude a and same timeperiod t and lie on the same line. at t=0 particle 1 is at a/2 and particle 2 is at -a/sqrt(2). if particle 1 and particle 2 move towards negative x axis. will they collide? if so find the time taken when both of them collide. | askiitians.com | 2021.39 | [
{
"text": "answer is t/24 if yes then reply i will give you the solution",
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},
{
"text": "no",
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"is_accepted": false
},
{
"text": "then 5t/24",
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6fde7c1fe1d7f9d88861f90bc3e420c2 | electric field at centre o of semicircle of radius a having linear charge density lambda is given as | askiitians.com | 2021.31 | [
{
"text": "consider a uniformly charged thin rod bent into a semicircle of radius r. find the electric field generated at the origin of the coordinate system. charge per unit length: ? = q/pr charge on slice: dq = ?rd? (assumed positive) electric field generated by slice: de = kdq/r^2=k*lamda/r *dtheta components of d~e : dex = de cos ?, dey = -de sin ? electric field from all slices added up: ex =0 ey= -2klambda/r thanks and regards sunil kr askiitian faculty",
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{
"text": "hello student consider a small element of length dl and charge = dq =λ dl , at which point the radius makes an angleθ with the vertical through the center of geometry of the semi circle. k = 1/(4πε) de = k dq/r² , makes an angle θ with the vertical. e x =0 the components along the y axis (vertical) add up. the limits are θ = -π/2 to π/2. dl = r dθ de y = (k λ /r) cos θ dθ integrating, e = (k λ / r) [sinθ ] from θ = -pi/2 to pi/2 e = 2 k λ/r i hope this answer will help you.",
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45d058d5658bb381bfa03c58495bdcb6 | a sonometer string and a tuning fork when sounded together gives 6 beats/sec, whether the length of sonometer string is 85 cm or 100 cm. the frequency of tuning fork is (a) 262 hz (b) 256 hz (c) 260 hz (d) 234 hz | askiitians.com | 2021.21 | [
{
"text": "probable frequencies of tuning fork be n + 4 or n − 4 frequency of sonometer wire n ∝ 1 l ∴ n + 4 n − 4 = 100 95 or 95 ( n + 4 ) = 100 ( n − 4 ) or 95 n + 380 = 100 n − 400 or 5 n = 780 or n = 156",
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{
"text": "letn = frequency of the tuning fork n1=frequency of the wire corresponding to length of l1 (39.5 cm) n2=frequency of the wire corresponding to length of l2 (40.5 cm) the frequency of wire is inversely proportional to its length hence,n1>n2 so, n1/n2=n+4 / n−4 [ since number of beats = 4] but, n1/n2=l2/l1 n+4 / n−4 = 40.5/39.5 40.5n−162=39.5n+158 n=320 hzans:frequency of the tuning fork=320 hz",
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b9d004a87cb374d05359ccb7fd7484f9 | the dehydrohalogenation reaction of trans 1-bromo-2-phenylcyclopentane with alc.koh produces ...????? wh is the major product??? hurry aieee exam approaching !!!! | askiitians.com | 2021.21 | [
{
"text": "the answer is 1-phenyl cyclopentene",
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"is_accepted": false
},
{
"text": "the correct answer for this question is not 1-phenylcyclopentene. but it is 3-phenylcyclopent-1-ene or 3-phenylcyclopentene.",
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c9daff78654e49774ee84240015f72c0 | prove using vectors the midpoints of two opposite sides of a quadriletral and mid points of the diagonals are the vertices of a parallelogram | askiitians.com | 2021.31 | [
{
"text": "dear raghu, you can take help of the link below, http://www.askiitians.com/iit-jee-mathematics/coordinate-geometry.aspx best of luck plz approve the answer...!!!! cracking iit just got more exciting,it’s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win exciting gifts by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple click here to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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7fcea5fcf45b8a4f33beeadd8cc37917 | a uniform, constant magnetic field b is directed at an angle of 45 to the x axis in the xy-plane. pqrs is s rigid, square wire frame carrying a steady current i 0 , with its centre at the origin o. at time t = 0, the frame is at rest n the position as shown in figure, with its sides parallel to the x and y axes. each side of the frame is of mass m and length l. (a) what is the torque τ about o acting on the frame due to the magnetic field ? (b) find the angle by which the frame rotates under the action of this torque in a short interval of time ∆t, and the axis about this rotation occurs. (∆t is so short that any variation in the torque during this interval may be neglected.) give : the moment of inertia of the frame about an axis through its centre perpendicular to its plane is 4/3 ml 2 | askiitians.com | 2021.39 | [
{
"text": "hello student, please find the answer to your question (a) as the magnetic field is in x – y plane and subtends an angles of 45° with the x –axis hence, b x = b cos 45° = b / √2 and b y = b sin 45° = b / √ 2 i.e., torque has magnitude i 2 0 l 2 b and is directed along line qs from q to s. (b) according to the theorem of perpendicular axes, moment of inertia of the frame about qs. i qs = 1 / 2 i z = 1/ 2 ( 4 / 3 ml 2 ) = 2 / 3 ml 2 also τ = iα, ∴ α = τ / i = i 0 l 2 b x 3 / 2ml 2 = 3 / 2 i 0 b / m here α is constant, therefore we can apply θ = ω 0 t + 1 / 2 αt 2 with ω 0 = 0, we have θ = 1 / 2 αt 2 = 1 / 2 (3i 0 b / 2m) (∆t) 2 or θ = 3 / 4 i 0 b / m (∆t) 2 thanks deepak patra askiitians faculty",
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8ce06b1d3dab660b76daabf1b1a81ee4 | i am expecting score in jee -2011 about 303-315 where could iget information about tentative ranks and can u breif me about branch change | askiitians.com | 2021.25 | [
{
"text": "hi , askiitians provide the iit jee cut off along with the opening and closing ran given below for iit jee cut off: http://www.askiitians.com/iit-jee-2011-counselling.html click for opening and closing ranks: http://www.askiitians.com/iits-2009-2010-opening-and-closing-rank.aspx thanks and all the best ..",
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{
"text": "dear bhaumik please check this link for better counselling regarding iit-jee results",
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{
"text": "i wanted a little more on branch change about wat it is how can it be done",
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916161a497ee1b5520e2c888e7335a8f | i am 12passed i got 72 in cbseboard am i aplicable for attempt iit2013 | askiitians.com | 2021.25 | [
{
"text": "you have not mentioned the year in which you have passed class 12. if you have passed in 2012 then you are eligible to apply. because the eligibility criteria includes 60% marks (gen) & 50% marks (sc/st) in board. and you can give iit only for 2 years, in the year of passing qualifying exam & the following year. you cannot give the iit jee exam if you once take admission in any of the iits.",
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7f85e33cf4ae28303f87421ca0bd90ef | can someone explain it to me in a detailed way? force of attraction between a hollow spherical shell of uniform mass density and a point mass situated outside is just as if the entire mass of the shell is concentrated at the centre of the shell. | askiitians.com | 2021.21 | [
{
"text": "dear student, by integration we can prove that spherically symmetric bodies (shell or solid sphere), can be thought of as if their mass is concentrated at the center of the body, when their interaction is considered with point masses outside. for detailed integration steps, you may refer to the book “concepts of physics by hc verma vol 1”.",
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a976f00ec436150132f0ce8637daa125 | why is meiosis called reduction division? describe the various stages with relevant diagrams. add a note on significance of meiosis. | askiitians.com | 2021.39 | [
{
"text": "t the process of meiosis involves two divisions of the genetic material. the first division is called the reduction division – or meiosis i – because it reduces the number of chromosomes from 46 chromosomes or 2n to 23 chromosomes or n (n describes a single chromosome set).",
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24789f772696ba5ffcc590d7531772ec | flux (in weber) in a closed circuit of resistance 10ohms varies with time t(in seconds) according to the equation flux=6t 2 -5t+1. the magnitude of the induced current in the circuit at t=0.25seconds is? | askiitians.com | 2021.25 | [
{
"text": "dear student diiferentiate the given wrt time and then divide it by resistance hope it helps regards arun (askiitians forum expert)",
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678262572f23d0b4870ee9a544ef1c19 | write one/two-word answer for each of the following : 1) the ray of light that bounces back from a plane mirror. 2) the nature of the image formed by a plane mirror. 3) the number of images formed by a pair of parallel plane mirrors. 4) a devices that is often used as “looking glass”. | askiitians.com | 2021.43 | [
{
"text": "1) reflected ray 2) virtual image 3) multiple images 4) mirror.",
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682d4a69e4db4df3139de4356eabe6d7 | if a+b+c=0, find the value of 1/2a 2 +bc+1/2b 2 +ca+1/2c 2 +ab | askiitians.com | 2021.25 | [
{
"text": "dear student take out 1/2 common from required expression 0.5( a+b+c)^2 = 0.5*0*0 =0 regards",
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"text": "dear student a + b + c = 0 ∴ a = -(b + c), b = -(c + a) , c = -(a + b) now, (2a² + bc ) = (a² + a² + bc) = {a² + a(-b - c) + bc} = a² - ab - ac + bc = a(a - b) -c(a - c) = (a - c)(a - b) ------------(1) similarly, (2b² + ca) = (b - c)(b - a) -------------(2) (2c² + ab) = (c - a)(c - b) --------------(3) now, lhs = 1/(2a² + bc ) + 1/(2b² + ca) + 1/(2c² + ab) = 1/(a - b)(a - c) + 1/(b - c)(b - a) + 1/(c - a)(c - b) = - 1/(a- b)(c - a) -1/(b - c)(a - b) - 1/(c - a)(b - c) = -[(b -c ) + (c - a) + (a - b)]/(a - b)(b - c)(c - a)] = 0 = rhs hope this helps good luck",
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f9b55390c012f1b93eeb5f56516c3e32 | two charge particles having charge q are seperated by a distance of l,they are projected wiht velocity v=q*(k/ml)^1/2.find minimum seperation between them | askiitians.com | 2021.25 | [
{
"text": "you can conserve energy here total potential(before) + kinetic energy(before) = total potential (after) + 0(kinetic after)",
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a198685a14a9a0d6c9f8d4a264ec5d77 | sir,i posted 3 ques. but did not get reply.... are bits hyd and goa rated same as bits pilani.... i scored 325 marks in bitsat. what branches can i get | askiitians.com | 2021.31 | [
{
"text": "definitely pilani is better than goa and hyd. hyd campus is new one , so it takes some time to get reputation for 325 marks, u may get some b tech branches in pilani . u may get civil , whihc i m not sure bcoz every yr the cutoff changes as well as dept cutoff ranks too all the best -- regards ramesh",
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ad49ed76a67a16d8b1161b996c0bb83c | sulphur is mobilise element or immobile elememt?............ | askiitians.com | 2021.31 | [
{
"text": "hi sulphur is a mobilise element especially in plant kingdom because it can one body parts to another.",
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60773de6e82e501e69abe454dbf34a0b | a technologist suspects that the truss design shown below in figure 1.1 is unstable and indeterminate. please answer the following: a) state and apply a simple formula to determine if the structure is determinate, comment on your findings (approximately 75 words) b) using methods of joints, check for stability of the structure (hint! review the reactions and forces in the members near and at the supports on the left hand side of the truss) c) based on your calculations above, comment on your findings also stating whether or not the current design is stable (approximately 75 words) d) suggest improvements to the current design such that the structure is determinate and stable (hint! review the supports in current design, also add members to the current design such that the truss is stable and determinate. due to material costs your new design must add only the minimum number of members e) for the new design use method of joints to calculate forces in all members, it is important you state your starting point and the plan for solving the problem f) using method of sections check your results for any 3 (three) members in the middle of the truss (i.e. approx 7 feet from either end) | askiitians.com | 2021.31 | [
{
"text": "this is the diagram for above question.",
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9804d12f82a20a3322343210323fef8a | which of the following larva has probably given origin to chordates?a)auriculariab)brachiolaric)pluteusd)bipinnaria | askiitians.com | 2021.21 | [
{
"text": "hi dear bipinnaria is the correct answer to your asked doubt. so option d is correct for the above asked query thanks keep posting",
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bcd6715e781bc6fb84391dcee03a16ab | iam not understanding what is pressure | askiitians.com | 2021.43 | [
{
"text": "pressure is defined as force per unit area formula is f/a unit of pressure is n/m 2 feel free to ask if you have any doubts approve my answer please but don't disapprove",
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2764b736143a4497e511303f941484a3 | plz tell me the cutoff for mahe manipal 2010 | askiitians.com | 2021.25 | [
{
"text": "dear student, cut off marks for the counseling is not available in the website so try contact the official they will tell you about the cut off marks. but the call for counselling is no guarantee whether you get admission or not, you should have applied in more institutes to get a better chance of admission. the first 2100 candidates have been called for the counselling. please feel free to ask your queries here. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar.. askiitians expert sagar singh b.tech, iit delhi [email protected]",
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a6fffd2297018fcb79e56bf5efe31773 | 16. express 98 as a product of its primes (a) 2² × 7 (b) 2² × 7² (c) 2 × 7² (d) 23 × 7 | askiitians.com | 2021.43 | [
{
"text": "answer: c",
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bf7239d4560b97c2682af95e1b98c181 | i need detaits about nitrobenzene | askiitians.com | 2021.43 | [
{
"text": "nitrobenzene is an organic compound with the chemical formula c₆h₅no₂. it is a water-insoluble pale yellow oil with an almond-like odor. it freezes to give greenish-yellow crystals approve if useful",
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4c9b433575c33e580766c151cb2fc571 | are there any short cuts techniques in calculus which would be useful for objective ques | askiitians.com | 2021.43 | [
{
"text": "dear siddhu yes many question can be solved by shortcut methods ,which is less time consuming. but these tricks varry accroding to questions . please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best. regards, askiitians experts badiuddin",
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1f6d362a78dd38751de1b9c709a24853 | how can see eml of iit ? | askiitians.com | 2021.25 | [
{
"text": "dear ankit, yes the eml ranks will be available on the iit websites shortly.. right now there is no such information available for this .. as soon as the list will be announced. you can check it on askiitians.com. please feel free to post as many doubts on our disucssion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best.",
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469a593498236e53aa26b9b58825cae8 | olympiad ka course & details. give me . 11 th class. | askiitians.com | 2021.21 | [
{
"text": "dear student, please refer the syllabus from the askiitians website. thanks.",
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881ccee26d4c6422485333ae1e3caed6 | 80. write s.i. unit of resistivity. [cbse 2015] | askiitians.com | 2021.31 | [
{
"text": "answer: explanation: ohm-metre.",
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7d6659df3f448f8941892bb65be53192 | hi i am getting 84+ percentile in bmat (brilliant tutorials) part tests for iitjee 2012. is it bad? please comment!! | askiitians.com | 2021.25 | [
{
"text": "dear abhishek, brilliants is of very low quality compared to newer classes like fiitjee etc. students still join brilliants because of its ancient glory days. brilliants tutorial is good for nothing. please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best abhishek !!! regards, askiitians experts chetan mandayam nayakar",
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e38273ca5c286b9111ef11bf4f10fe23 | if i score 230 what rank do i expect in iit jee 2012 | askiitians.com | 2021.43 | [
{
"text": "you will get a rank near to 7000",
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},
{
"text": "dear sandip you have scored very well. your expected rank is about 3500. congrajulations. if this answer was helpful then please click on like this answer. please sandip thank you best of luck",
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026f25e034ac2f15d3172bccee1c049f | please provide a detailed solution for this question.aiims 4 q112 | askiitians.com | 2021.25 | [
{
"text": "hai anmol seth, b is wrong in the question they are asking for wrong statement a) a and b are in competetion (correct statement) explanation: their population become equivalent at a point and lead to competetion. after that common point b species population increased and a decreased. b) b and c are not commensals (wrong statement) explanation: commensalism, in ecology, is a type of relationships between two organisms where one organism benefits from the other without affecting it. affect is oberved here they are also not in competetion because the popultion of b increased and c remained constant c) a and c amensalism (wrong statement) ammensalism-amensalism is an relationship between organisms of different species in which one organism is inhibited or destroyed (not destroyed)",
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de57a056298a43aad55d851fa828ad88 | one mole of ideal gas required 207 j heat to rise the temperature by 10°k when heated at constant pressure. if the same gas is heated at constant volume to raise the temperature by the same 10°k the heat required is (r = 8/3 j/mole °k) (a) 1987 j (b) 29 j (c) 215.3 j (d) 124 j | askiitians.com | 2021.43 | [
{
"text": "for 1 mole, cp-cv=r heat at constant pessure,q=1*cp*dt .. 207=cp*10 cp=20.7 heat at constant pressure, q’=1*cv*dt=(cp-r)*10=(20.7-18.3)*10j=124j hence answer is (d)",
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{
"text": "for 1 mole,cp-cv=rheat at constant pessure,q=1*cp*dt. 207=cp*10cp=20.7heat at constant pressure,q’=1*cv*dt=(cp-r)*10=(20.7-8.314)*10j=124jhence answer is (d)",
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{
"text": "dear student, please find below the solution to your problem. for 1 mole, cp-cv=r heat at constant pessure, q=1*cp*dt 207=cp*10 cp =20.7 heat at constant pressure, q’=1*cv*dt =(cp-r)*10 =(20.7-18.3)*10j =124j thanks and regards",
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8c208e59dd0847144b287d9e676c2c55 | prokaryotes .......................................... | askiitians.com | 2021.43 | [
{
"text": "these organisms have primitive and incomplete cells.",
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bc0f96dc4804b4b8d396827b75b85171 | helloz! i didnt clear jee dis year. i got eee rank 22659. i hav taken admission in ymca faridabad. i want to give iit a second try.but since my peers were not agreeing for a full drop, i had to do so. i have taken admission in dce nsit batch of brilliant tutorials. i was student of vmc for last two years. i came to know that vmc too runs dis kind of batch. so shall i stick to brilliant or take up vmc. brilliant is very near to my home but vmc is not. so plz help. | askiitians.com | 2021.43 | [
{
"text": "dear yachana........ vmc is better than brilliant and according to me hardwork is the key to success and gave the good future....so u can join vmc rather than brilliant........gud luck........... please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum.",
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192897239a11a321967b34484ea02d58 | rohtaz sir please help me | askiitians.com | 2021.39 | [
{
"text": "dear student question is not clear please upload an image. we will happy to help you. good luck cheers",
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80a0ec5ebb262df09e98b52dabb84d89 | the no. of points in cartesian plane with integral coordinates satisfying inequalities 1. (x) lesser than equal to k 2. (y) lesser than equal to k 3. (x – y) lesser than equal to k where ( ) represemts modulus is: (k+1) ^3 – k^3 (k+2)^3 – (k+1)^3 (k^2+1) | askiitians.com | 2021.43 | [
{
"text": "dear student please write the question in a standard form or attach an image of the question regards",
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8d219d6191a83c1d61a1f2f2bbfededf | the precession frequency of a proton in a magnetic field of 0.5weber/m 2 | askiitians.com | 2021.31 | [
{
"text": "dear student the precessional frequency of nuclei of a substance placed in a static magnetic field b0 is calculated from the larmor equation: ω = γb the proton's gyromagnetic ratio, symbol γp, is 2.675222005×10^8 rad⋅s−1⋅t−1 ω = 2.675222005×10^8 * 0.5 = 1.3375 *10^8 hope this helps",
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7bd2c8c991623d3b090d70ffaab83177 | which of the following is the ‘biodiversity hot spots’ ? (a) rivers (b) forests (c) deserts (d) oceans | askiitians.com | 2021.39 | [
{
"text": "answer: b",
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"text": "anser is b pls mark it as verifiedby armaanarora the best educator at private platform in kota studied at mit",
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2f2eaa1c4e525f04b0a68b72f64212a3 | a 10 kg weight is raised to a geight of 2 m with an acceleration of 1.5 metre per secobd square .compute the work done if g=10 metre per second square . | askiitians.com | 2021.39 | [
{
"text": "dear student work done w = f. d here f is n + ma= mg ( lift is moving upwards so, n and accelerating force are in same direction) n = m (g - a) n = 10 (10 - 1.5 ) n= 85 and d= height=2m therefore w = 85*2 = 170 n with regards mahima askiitians forum expert",
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98a27df65455c2b018d11ce057c0726c | find the interval in which f(x) is increasing f(x) = ∫e t (t-1)(t-2)dt limit is from t = 0 to t = x. | askiitians.com | 2021.25 | [
{
"text": "ans: hello student, please find answer to your question below apply newton leibniz formula, we have f(x) is increasing in the interval e x is always +ve for all x. so we have using wavy curve method",
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07968c2b5903e4d490921a04cbc17968 | sir i will probably get biotech at iitg...what will i have to do if i want to change the branch to engg. physics | askiitians.com | 2021.21 | [
{
"text": "study from the begining score more than 9 gpa, and its not easy.",
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33da9eb9192d119b85ad12e665dcf822 | fill up the blanks. 1. cocaine interfere with the transport of the neuro-transmitter................. 2. the lymphoid tissue located within the lining of respiratory ,digestive and urinogental tract is called................ 3. plasmodium enters into the human host in the form of................ 4. ring worms belong to the fungal genus......... | askiitians.com | 2021.31 | [
{
"text": "cocaine interfere with the transport of the neuro-transmitter dopamine. the lymphoid tissue located within the lining of respiratory ,digestive and urinogental tract is called mucosal-associated lymphoid tissue. plasmodium enters into the human host in the form of sporozoites. ring worms belong to the fungal genus dermatophyte.",
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5b79f1d52bbaf55b5ef02433c978d303 | hello.. i hv been alloted a seat in second allotmentat rorkee... since there r only 3-4 days left 4 registration.... hw will i receive d offer letter.....?? | askiitians.com | 2021.21 | [
{
"text": "please go with print out taken from site, they will consider your case for registration.",
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8d9f04a068437e18f036296d19916450 | far a minimum deviation refracted ray should be parallel to the base of the prism can u give the proof? | askiitians.com | 2021.21 | [
{
"text": "refraction through a prism:- a prism is a wedge-shaped body made from a refracting medium bounded by two plane faces inclined to each other at some angle. the two plane faces are called are the refracting faces and the angle included between these two faces is called the angle of prism or the refracting angle. in the below figure (1), abc represents the principal section of a glass-prism having∠a as its refracting angle. a ray kl is incident on the face ab at the point f where n1lo is the normal and∠i1is the angle of incidence. since the refraction takes place from air to glass, therefore, the refracted ray lm bends toward the normal such that∠r1is the angle of refraction. ifµ be the refractive index of glass with respect to air, then µ = sin i/sin r (by snell’s law) the refracted ray lm is incident on the face ac at the point m where n2mo is the normal and∠r2is the angle of incidence. since the refraction now takes place from denser to rarer medium, therefore, the emergent ray mn such that∠i2is the angle of emergence. in the absence of the prism, the incident ray kl would have proceeded straight, but due to refraction through the prism, it changes its path along the direction pmn. thus,∠qpn gives the angle of deviation ‘δ’, i.e., the angle through which the incident ray gets deviated in passing through the prism. thus, δ = i1– r1+ i2-r2 ….... (1) δ = i1+ i2– (r1+r2) again, in quadrilateral alom, ∠alo +∠amo = 2rt∠s [since,∠alo = ∠amo = 90º] so,∠lam +∠lom =2rt∠s [since, sum of four ∠s of a quadrilateral = 4 rt∠s] ….... (2) also in?lom, ∠r1+∠r2+∠lom = 2rt∠s …... (3) comparing (2) and (3), we get ∠lam =∠r1+∠r2 a =∠r1+∠r2 using this value of∠a, equation (1) becomes, δ = i1+ i2- a ori1+ i2=a +δ …... (4) the angle of deviation of a ray of light in passing through a prism not only depends upon its material but also upon the angle of incidence. the above figure (2) shows the nature of variation of the angle of deviation with the angle of incidence. it is clear that an angle of deviation has the minimum value ‘δm’for only one value of the angle of incidence.the minimum value of the angle of deviation when a ray of light passes through a prism is called the angle of minimum deviation. the figure (3) shows the prism abc, placed in the minimum deviation position. if a plane mirror m is placed normally in the path of the emergent ray mn the ray will retrace its original path in the opposite direction nmlk so as to suffer the same minimum deviation dm. in the minimum deviation position,∠i1=∠i2 and so∠r1=∠r2=∠r (say) obviously,∠alm =∠lma = 90º –∠r thus, al = lm and so lm l l bc",
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68439eb8f7ffc82c1e84b51ded4d1407 | a rod of uniform cross section area a and length l has a weight w. it is suspended vertically from a fixed support. the material of the rod is homogeneous and the modulud of elasticity is y. if a concentrated force f is also applied at the free end of the rod, then find the total elongation of the rod. | askiitians.com | 2021.25 | [
{
"text": "dear sanchit gupta ans: first of all let's calculate the total extension of the rod. we know that stress/strain =υ. as the mass is uniformly distributed and hence it is acting at a distance l/2 from the top so, w/a=υδl/(l/2) hence δl=wl/2ay; now the external force f can act as both as a tensile as well as compressive force. hence the total change in length will be case 1 δl=(wl+f)l/2ay when f is tensile; case 2δl=(wl-f)l/2ay when f is compressive. please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best sanchit gupta !!! regards, askiitians experts soumyajit das iit kharagpur",
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a1a7ae79a5d40039f2e7bc546d0179a7 | explian in breif | askiitians.com | 2021.25 | [
{
"text": "e.m.f. e.m.f. stands for electromotive force, given the symbol e and has the si units of volts, v. e.m.f. however, is not a force but an increase in potential (energy). cells, batteries, dynamos, solar pannels etc produce a potential difference that can induce current. this potential differnce requires a different name from the voltage across a resistor. a resistor causes a decrease in potential as energy leaves the circuit normally in the form of heat. definition the e.m.f. of a source (a device which supplies electrical energy) is defined as the energy converted to electrical energy when unit of charge (i.e. 1 coulomb) passes through it. terminal potential difference definition the terminal p.d. of a source is the potential difference across its terminals, it is often given the symbol v. internal resistance while a cell gives electrons energy to flow and form a current, some of that energy is used up by movement in the cell itself. this is why batterries become warm after extented use. the cell itself has a resistance which the electrons have to overcome, this is called the internal resistance and is given the symbol r or r internal , and has the si units of ohms. the result of this is that as more current is drawn the terminal p.d. will drop. we model this by thinking of a cell as a source of e.m.f. in series with a resistor whose resistance is the internal resistance. when there is no current flowing then the terminal p.d. is the same as the e.m.f. as there is no potential drop over the internal resistance (using v internal =ir internal when i=0). when current flows however energy (potential) is lost overcoming internal resistance and the terminal voltage decreases. the e.m.f., internal resistance and current drawn can be linked by the following equation: v = e - ir internal the electric potential difference (v) is the work done per unit charge as a charge is moved be- tween two points in an electric field.",
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a0793743077328d4f061d51464fcf72c | zss | askiitians.com | 2021.31 | [
{
"text": "dear student, please post your question....its not clear what you want to ask... please feel free to ask your queries here. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar.. askiitians expert sagar singh b.tech, iit delhi [email protected]",
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3f9d17f8a94e4fdffcc78240f7958ff8 | a string is wrapped over the edge of a uniform disc and the free end is fixed with the ceiling. the disc moves down, unwinding the string. find the downward acceleration of the disc. | askiitians.com | 2021.39 | [
{
"text": "dear vrushabh, t.r=i.w m(g-a).r=m(r^2).a/2r (g-a)=a/2 g=3/2a a=2/3g (ans) regards.",
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cbfaad04cb8f21aa4c50eded5d8eb440 | do we need to submit working project? | askiitians.com | 2021.39 | [
{
"text": "hi , your questioon is not clear ? please post again.",
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"is_accepted": false
},
{
"text": "dear friend you can apply to kvpy by your board and school results if you are a 11/12 class student - you'll have to give a written test and an interview to qualify you can also apply with a project which is to be approved by the surveying committee ... but this option is suitable for engg. or bs/ms student for more information you can refer to the kvpy website www.iisc.ernet.in/ kvpy /",
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2355ff018633c6c4199ac5cb610cd4f7 | how much marks should i score for to be in 5000 in jee main(aieee) | askiitians.com | 2021.31 | [
{
"text": "dear students, this varies from year to year",
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|
4f7ba2c5832bb3ce0c232c460c6ae1be | on what bases are plants and animals put into different categories? | askiitians.com | 2021.31 | [
{
"text": "dear student mode of nutrition and presence or absence of cell walls. thanks",
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|
20fffa3265ac796f474494114c5ee4bf | i got 1281 in sc category. please suggest in the order of institute and branch ranking as to which iit and what branch i may get? i am a girl candidate. please suggest whether i should go for mining/metallurgy. shubhra | askiitians.com | 2021.43 | [
{
"text": "come to my home at night & i will tell everything girl come fast missing u baby ….......................................................................................................................................................",
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1871e605b05ee107ef38e7be7eb167c8 | what was used cathode ray experiment? | askiitians.com | 2021.25 | [
{
"text": "followings were used:- (1)a high voltage power supply for the flow of current. (2)fluorescent screen (3)cathode and anode made of a thin wire filament (4)condtion for creating vaccum thanks and regards sunil kr askiitian faculty",
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98b9627432e132176215c7efbd1742ab | a compound pendulum(solid copper plate) swings in front of magnetic field perpendicular to plate. what will be its effect. will it stop suddenly or damping effect or no effect. what if plate has several holes. | askiitians.com | 2021.39 | [
{
"text": "dear super daman, due to eddy currents, plate will get damped. but, in case of plate having holes, this effect will increase and plate will come to rest. post all your doubts here. approve it if you like it. best of luck! regards, a s",
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572114e69ed0b78395e98738d8de9087 | which of the mixture could act as apropellant for rockets? | askiitians.com | 2021.39 | [
{
"text": "liquid hydrogen and liquid oxygen are used as excellent fuel for rockets. h 2(l) has low mass and highenthalpy of combustion whereas oxygen is a strong supporter of combustion.",
"name": "",
"is_accepted": false
},
{
"text": "oxygen and ethelene mixture",
"name": "",
"is_accepted": false
},
{
"text": "o2+h2",
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"is_accepted": false
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23a0c305323047d17b9f7c79a8e1582e | find the absolute maximum and minimum value,f(x)=x^3 ,x bilongs to [-2,2] | askiitians.com | 2021.21 | [
{
"text": "dear student we can observe that maximum value is 8 and minimum value is -8 in the given range. thanks",
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819327a53e168b7cf070ec7f65794431 | two non-conducting solid spheres of radii r and 2r, having uniform volume charge densities ?1 and ?2 respectively, touch each other. the net electric field at a distance 2r from the centre of the smaller sphere, along the line joining the centre of the spheres is zero. the ratio ?1/?2 can be | askiitians.com | 2021.21 | [
{
"text": "dear student please attach the image of the question regards",
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{
"text": "dear student question is not clear please attach an image, we will happy to help you good luck cheers",
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1bada14098e1d405d1a172e529704aa2 | what is hybridization? | askiitians.com | 2021.39 | [
{
"text": "hybridization is the name we use to describe the process of change from atomic orbitals to bonding orbitals. we refer to the orbitals that have been changed as hybrid orbitals.",
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1883bad797c9ce53fab30d5dc54c2b72 | if 5sinx + 4cosx = 3 . then find the value of 4sinx – 5cosx | askiitians.com | 2021.43 | [
{
"text": "we sole (5 sin x+4 cos x =3) we get x=473.34 degrees similarly the value of (4 sin x – 5 cos x)=5.652",
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|
3d20f141505a4bc34d9cab7ba012f426 | how thw cell mediated system work when the body is infected | askiitians.com | 2021.31 | [
{
"text": "hello student, cell mediated immune system acts when a body is attacked by a foreign body called antigen and it does not involve antibodies. it involves activation of body cells like phagocytes, tcells and cytokines and mediates apoptosis of infected cells.",
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038f4639d68f27e1d7f25047b7001c91 | how many marks in iit-jee | askiitians.com | 2021.21 | [
{
"text": "dear yaman, for cut off of iit-jee 2012 check this link http://www.askiitians.com/iit-jee-2012/iit-jee-2012-cutoff.html cracking iit just got more exciting,it s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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a42ff069e8d72e8c1e84db2d3dce1e94 | what is the difference between lanthenoid contraction and actinoid contraction | askiitians.com | 2021.31 | [
{
"text": "the regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction. lanthanoid contraction: the steady decrease in the atomic and ionic radii of the transition metals as the atomic number increases. this is because of filling of 4f orbitals before the 5d orbitals. this contraction is size is quite regular. this is called lanthanoid contraction. it is because of lanthanoid contraction that the atomic radii of the second row of transition elements are almost similar to those of the third row of transition elements. thus, the regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction. actinoid contraction: the gradual decrease in the ionic radii with the increase in atomic no. is called actinoid contraction. explanation: it is due to the imperfect shielding of one 5f electrons by another in the same subshell. along the series, the nuclear charge and no. of 5f electrons increases by one unit. however, due to imperfect shielding of 5f orbitals, the effective nuclear charge increases which results in contraction of the size. thanks & regards mukesh sharma askiitians faculty",
"name": "",
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{
"text": "the regular decrease in atomic and ionic radiiand inc in atomic number is called as lanthanoid contraction",
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{
"text": "hey... u there she say do u love me i tell i only partly i only love my bed and my mom... i am sorry ;-)",
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{
"text": "the regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction. dear student, please find below the solution to your problem. lanthanoid contraction: the steady decrease in the atomic and ionic radii of the transition metals as the atomic number increases. this is because of filling of 4f orbitals before the 5d orbitals. this contraction is size is quite regular. this is called lanthanoid contraction. it is because of lanthanoid contraction that the atomic radii of the second row of transition elements are almost similar to those of the third row of transition elements. thus, the regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction. actinoid contraction: the gradual decrease in the ionic radii with the increase in atomic no. is called actinoid contraction. explanation: it is due to the imperfect shielding of one 5f electrons by another in the same subshell. along the series, the nuclear charge and no. of 5f electrons increases by one unit. however, due to imperfect shielding of 5f orbitals, the effective nuclear charge increases which results in contraction of the size. thanks and regards",
"name": "",
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}
] |
|
d6c80c2081786708dc6f8cdb8288032d | a diffraction grating used at normal incidence gives a yellow line,λ=5750å in a certain spectral order superimposed on a blue line,λ=4600å of next higher order. if the angle of diffraction is 30°,what is the spacing between the grating line? | askiitians.com | 2021.43 | [
{
"text": "we have sin30°=nn5750×10^-10..... (1) sin30°=nn4600×0^-10.....(2) equating we get n=4 substitute values of n in equation (1) we get n=217,391 lines per meter. for finding spacing between lines d=1/n d=4.60 meter",
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] |
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43a7982e7d5b8c4718fbc5c9f496644f | find the number 1-1 function, s(a)- a satisfying f(f(i))= i, a has four elements {1,2,3,4}. | askiitians.com | 2021.39 | [
{
"text": "dear student total one one function will be = 4 * 3* 2* 1 = 4! = 24 hope it helps regards arun (askiitians forum expert) regards arun",
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] |
|
f6a9e2703d47df4798ebe19f7e070770 | ultraviolet light of wavelength lambda 1 and lambda 2 when allowed to fall on a hydrogen atoms in their ground state is found to liberate electrons with kinetic energy 1.8ev and 4ev respectively.find the value of lambda 1/lambda 2 (l1/l2) | askiitians.com | 2021.25 | [
{
"text": "since electrons are liberated hence the total energoes must be 15.4ev and 17.6ev respectively.now using the formula e=hc/lambda we will get lambda in both the cases keeping hc= 12400( lamba in the order of angstrom order).now just take their ratio.",
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},
{
"text": "since electron travel from ground state to infinity so the energy liberated is 13.6 ev + kinetic energy 13.6 + 1.8 =15.4ev 13.6 + 4 = 17.6 ev now we know e=hc/lamda(in angstrom) we want lambda1/lambda2= 17.6/15.4 = 8/7",
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}
] |
|
46bf284a9c51369792e864a94535fc64 | if x = cos55, y=cos 65 and z =cos 175 then xy +yz +zx = | askiitians.com | 2021.25 | [
{
"text": "= cos55cos65+cos175cos65+cos175cos55 = cos65(cos55+cos175)+cos175cos55 = cos65(2cos115cos65)+cos175cos55 [cosa+cosb=12cos( a+b/2 )cos( a-b/2 )] = cos65cos115+cos(180-5)cos55 [cos175=cos(180-5)=-cos5, cos60= ½ ] =cos65cos115-cos5cos55 = ½ [2cos65cos115-2cos5cos55] = ½ [cos180+cos50-(cos60+cos50)] [2cosacosb=cos(a+b)cos(a-b)] = ½ [cos180-cos60] = ½ [0-½] = – ¼",
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}
] |
|
07ae2c17abb867191db371ce5c5a9fe2 | cosec square60 degrees +sec square30 degree+cossquare45degree | askiitians.com | 2021.25 | [
{
"text": "dear student, please see your solution below, cosec^2 60 + sec^2 30+ cos^2 45 = 2/√ 3 * 2/√ 3 +2/√ 3 * 2/√ 3 + 1/√2*1/√2 =4/3 +4/3 + 1/2 =19/6 askiitian expert",
"name": "",
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] |
|
900924caa787cdba266f7add54a0d504 | ionic radii are a) inversely proportional to effective nuclear charge b) inversely proportional to square of effective nuclear charge c) directly proportional to effective nuclear charge d) directly proportional to square of effective nuclear charge | askiitians.com | 2021.21 | [
{
"text": "a exp: ionic radii are inversely proportional to effective nuclear charge. ionic radii in the n th orbit is given as? ???? when n = principle quantum number z – effective nuclear change.",
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|
7486c96bad37fd9380d599851394ca39 | let 0<= x <=90 degees. prove that sin(x) >= (2x)/pi. | askiitians.com | 2021.39 | [
{
"text": "dear aritra, between 0 to 90 value of 2x/∏ will be 0 to 1 so the and sin is increasing in the interval between 0 to ∏/2 from 0 to 1 sinx - 2x/∏ is increasing we can check that from differentiation its value also lie between 0 to 1 we are all iitians and here to help you in your iit jee preparation. now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar : click here to download the toolbar..",
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|
24293a816d9267eed07a87ea256126f4 | sponges show cellular level of organization but they can perform many functions...how is that possible with a cell | askiitians.com | 2021.21 | [
{
"text": "sponges do not have organs or true tissues, however, they do have specialized cells that can carry out distinct functions within the organism. this is generally referred to as cellular-level organization",
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}
] |
|
8aaac6ce5fd84c71ae09b9c06d5c13bc | determine the effective resistance of the given circuit.sir please explain how to redraw the figure also | askiitians.com | 2021.31 | [
{
"text": "dear student if you open this then you will find it in parallel hence 1,2 and 3 ohm are in parallel regards arun (askiitians forum expert)",
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|
def5ef52e8c818dee5314b5c04cc9732 | how much voume. of water should be added to convert 100 ml of .1m solution into 0.01m solution | askiitians.com | 2021.25 | [
{
"text": "initial volume of sol = 0.1 moles/v = m moles = mv (m molality & v volume in liters) moles of solute = 0.1*0.01 = .01 let volume of water added = v litre then final vol will be (0.1+v) finall molarity = moles/volume = 0.01/(0.1+v) , this should be equal to 0.01 0.001/(0.1+v) = 0.01 v = 0.9l=900ml ans approve if u like it",
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{
"text": "900ml",
"name": "",
"is_accepted": false
},
{
"text": "dear student, use molarity=moles/volume of the solution please feel free to ask your queries here. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar.. askiitians expert sagar singh b.tech, iit delhi",
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1e9b7e7adc54df91a2cb8742708e8554 | f(x) & g(x) r 2 cont functions defined for [0,1] f(x) =∫ e x+t f(t) dt g(x) = ∫ e x+t g(t) dt +x. find f(1) , g(0)-f(0) , g(0)/g(2). | askiitians.com | 2021.25 | [
{
"text": "dear dinesh given f(x) & g(x) r 2 cont functions defined for [0,1] so g(2) can't be obtain from the given difinition of function please check question and post again please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee & aieee preparation. all the best. regards, askiitians experts badiuddin",
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|
83f620bb56d369be9548a884078efd95 | what is the expected cutoff rank for mechanical engg. at bits mesra | askiitians.com | 2021.21 | [
{
"text": "hey somesh please go through this link http://www.askiitians.com/bitsat/cutoffs.html thanks keep posting",
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|
e9362dad1a17d257620f5ed4458e8291 | if there are two charges q1 and q2 at separation r. if we introduce a metal sheet at midway perpendicular to the line joining them,what will be the new force experienced by any one of charge? | askiitians.com | 2021.39 | [
{
"text": "i think we can apply here, the concept of image charges. just put a charge a -q1 with q2 so that there will be two charges q1 and (q2-q1) at a separation r. now apply columb`s law.if the above method doesn`t work then apply the concept of induction.please verify my former method.",
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