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9 | 2039-2042 | 11 4
Monochromatic light of wavelength 632 8 nm is produced by a
helium-neon laser The power emitted is 9 |
9 | 2040-2043 | 4
Monochromatic light of wavelength 632 8 nm is produced by a
helium-neon laser The power emitted is 9 42 mW |
9 | 2041-2044 | 8 nm is produced by a
helium-neon laser The power emitted is 9 42 mW (a) Find the energy and momentum of each photon in the light beam,
(b) How many photons per second, on the average, arrive at a target
irradiated by this beam |
9 | 2042-2045 | The power emitted is 9 42 mW (a) Find the energy and momentum of each photon in the light beam,
(b) How many photons per second, on the average, arrive at a target
irradiated by this beam (Assume the beam to have uniform
cross-section which is less than the target area), and
(c) How fast does a hydrogen atom have to travel in order to have
the same momentum as that of the photon |
9 | 2043-2046 | 42 mW (a) Find the energy and momentum of each photon in the light beam,
(b) How many photons per second, on the average, arrive at a target
irradiated by this beam (Assume the beam to have uniform
cross-section which is less than the target area), and
(c) How fast does a hydrogen atom have to travel in order to have
the same momentum as that of the photon 11 |
9 | 2044-2047 | (a) Find the energy and momentum of each photon in the light beam,
(b) How many photons per second, on the average, arrive at a target
irradiated by this beam (Assume the beam to have uniform
cross-section which is less than the target area), and
(c) How fast does a hydrogen atom have to travel in order to have
the same momentum as that of the photon 11 5
In an experiment on photoelectric effect, the slope of the cut-off voltage
versus frequency of incident light is found to be 4 |
9 | 2045-2048 | (Assume the beam to have uniform
cross-section which is less than the target area), and
(c) How fast does a hydrogen atom have to travel in order to have
the same momentum as that of the photon 11 5
In an experiment on photoelectric effect, the slope of the cut-off voltage
versus frequency of incident light is found to be 4 12 × 10–15 V s |
9 | 2046-2049 | 11 5
In an experiment on photoelectric effect, the slope of the cut-off voltage
versus frequency of incident light is found to be 4 12 × 10–15 V s Calculate
the value of Planck’s constant |
9 | 2047-2050 | 5
In an experiment on photoelectric effect, the slope of the cut-off voltage
versus frequency of incident light is found to be 4 12 × 10–15 V s Calculate
the value of Planck’s constant 11 |
9 | 2048-2051 | 12 × 10–15 V s Calculate
the value of Planck’s constant 11 6
The threshold frequency for a certain metal is 3 |
9 | 2049-2052 | Calculate
the value of Planck’s constant 11 6
The threshold frequency for a certain metal is 3 3 × 1014 Hz |
9 | 2050-2053 | 11 6
The threshold frequency for a certain metal is 3 3 × 1014 Hz If light
of frequency 8 |
9 | 2051-2054 | 6
The threshold frequency for a certain metal is 3 3 × 1014 Hz If light
of frequency 8 2 × 1014 Hz is incident on the metal, predict the cut-
off voltage for the photoelectric emission |
9 | 2052-2055 | 3 × 1014 Hz If light
of frequency 8 2 × 1014 Hz is incident on the metal, predict the cut-
off voltage for the photoelectric emission 11 |
9 | 2053-2056 | If light
of frequency 8 2 × 1014 Hz is incident on the metal, predict the cut-
off voltage for the photoelectric emission 11 7
The work function for a certain metal is 4 |
9 | 2054-2057 | 2 × 1014 Hz is incident on the metal, predict the cut-
off voltage for the photoelectric emission 11 7
The work function for a certain metal is 4 2 eV |
9 | 2055-2058 | 11 7
The work function for a certain metal is 4 2 eV Will this metal give
hotoelectric emission for incident radiation of wavelength 330 nm |
9 | 2056-2059 | 7
The work function for a certain metal is 4 2 eV Will this metal give
hotoelectric emission for incident radiation of wavelength 330 nm 11 |
9 | 2057-2060 | 2 eV Will this metal give
hotoelectric emission for incident radiation of wavelength 330 nm 11 8
Light of frequency 7 |
9 | 2058-2061 | Will this metal give
hotoelectric emission for incident radiation of wavelength 330 nm 11 8
Light of frequency 7 21 × 1014 Hz is incident on a metal surface |
9 | 2059-2062 | 11 8
Light of frequency 7 21 × 1014 Hz is incident on a metal surface Electrons with a maximum speed of 6 |
9 | 2060-2063 | 8
Light of frequency 7 21 × 1014 Hz is incident on a metal surface Electrons with a maximum speed of 6 0 × 105 m/s are ejected from
the surface |
9 | 2061-2064 | 21 × 1014 Hz is incident on a metal surface Electrons with a maximum speed of 6 0 × 105 m/s are ejected from
the surface What is the threshold frequency for photoemission of
electrons |
9 | 2062-2065 | Electrons with a maximum speed of 6 0 × 105 m/s are ejected from
the surface What is the threshold frequency for photoemission of
electrons 11 |
9 | 2063-2066 | 0 × 105 m/s are ejected from
the surface What is the threshold frequency for photoemission of
electrons 11 9
Light of wavelength 488 nm is produced by an argon laser which is
used in the photoelectric effect |
9 | 2064-2067 | What is the threshold frequency for photoemission of
electrons 11 9
Light of wavelength 488 nm is produced by an argon laser which is
used in the photoelectric effect When light from this spectral line is
incident on the emitter, the stopping (cut-off) potential of
photoelectrons is 0 |
9 | 2065-2068 | 11 9
Light of wavelength 488 nm is produced by an argon laser which is
used in the photoelectric effect When light from this spectral line is
incident on the emitter, the stopping (cut-off) potential of
photoelectrons is 0 38 V |
9 | 2066-2069 | 9
Light of wavelength 488 nm is produced by an argon laser which is
used in the photoelectric effect When light from this spectral line is
incident on the emitter, the stopping (cut-off) potential of
photoelectrons is 0 38 V Find the work function of the material from
which the emitter is made |
9 | 2067-2070 | When light from this spectral line is
incident on the emitter, the stopping (cut-off) potential of
photoelectrons is 0 38 V Find the work function of the material from
which the emitter is made 11 |
9 | 2068-2071 | 38 V Find the work function of the material from
which the emitter is made 11 10 What is the de Broglie wavelength of
(a) a bullet of mass 0 |
9 | 2069-2072 | Find the work function of the material from
which the emitter is made 11 10 What is the de Broglie wavelength of
(a) a bullet of mass 0 040 kg travelling at the speed of 1 |
9 | 2070-2073 | 11 10 What is the de Broglie wavelength of
(a) a bullet of mass 0 040 kg travelling at the speed of 1 0 km/s,
(b) a ball of mass 0 |
9 | 2071-2074 | 10 What is the de Broglie wavelength of
(a) a bullet of mass 0 040 kg travelling at the speed of 1 0 km/s,
(b) a ball of mass 0 060 kg moving at a speed of 1 |
9 | 2072-2075 | 040 kg travelling at the speed of 1 0 km/s,
(b) a ball of mass 0 060 kg moving at a speed of 1 0 m/s, and
(c) a dust particle of mass 1 |
9 | 2073-2076 | 0 km/s,
(b) a ball of mass 0 060 kg moving at a speed of 1 0 m/s, and
(c) a dust particle of mass 1 0 × 10–9 kg drifting with a speed of 2 |
9 | 2074-2077 | 060 kg moving at a speed of 1 0 m/s, and
(c) a dust particle of mass 1 0 × 10–9 kg drifting with a speed of 2 2
m/s |
9 | 2075-2078 | 0 m/s, and
(c) a dust particle of mass 1 0 × 10–9 kg drifting with a speed of 2 2
m/s 11 |
9 | 2076-2079 | 0 × 10–9 kg drifting with a speed of 2 2
m/s 11 11 Show that the wavelength of electromagnetic radiation is equal to
the de Broglie wavelength of its quantum (photon) |
9 | 2077-2080 | 2
m/s 11 11 Show that the wavelength of electromagnetic radiation is equal to
the de Broglie wavelength of its quantum (photon) Rationalised 2023-24
Physics
290
12 |
9 | 2078-2081 | 11 11 Show that the wavelength of electromagnetic radiation is equal to
the de Broglie wavelength of its quantum (photon) Rationalised 2023-24
Physics
290
12 1 INTRODUCTION
By the nineteenth century, enough evidence had accumulated in favour of
atomic hypothesis of matter |
9 | 2079-2082 | 11 Show that the wavelength of electromagnetic radiation is equal to
the de Broglie wavelength of its quantum (photon) Rationalised 2023-24
Physics
290
12 1 INTRODUCTION
By the nineteenth century, enough evidence had accumulated in favour of
atomic hypothesis of matter In 1897, the experiments on electric discharge
through gases carried out by the English physicist J |
9 | 2080-2083 | Rationalised 2023-24
Physics
290
12 1 INTRODUCTION
By the nineteenth century, enough evidence had accumulated in favour of
atomic hypothesis of matter In 1897, the experiments on electric discharge
through gases carried out by the English physicist J J |
9 | 2081-2084 | 1 INTRODUCTION
By the nineteenth century, enough evidence had accumulated in favour of
atomic hypothesis of matter In 1897, the experiments on electric discharge
through gases carried out by the English physicist J J Thomson (1856 –
1940) revealed that atoms of different elements contain negatively charged
constituents (electrons) that are identical for all atoms |
9 | 2082-2085 | In 1897, the experiments on electric discharge
through gases carried out by the English physicist J J Thomson (1856 –
1940) revealed that atoms of different elements contain negatively charged
constituents (electrons) that are identical for all atoms However, atoms on a
whole are electrically neutral |
9 | 2083-2086 | J Thomson (1856 –
1940) revealed that atoms of different elements contain negatively charged
constituents (electrons) that are identical for all atoms However, atoms on a
whole are electrically neutral Therefore, an atom must also contain some
positive charge to neutralise the negative charge of the electrons |
9 | 2084-2087 | Thomson (1856 –
1940) revealed that atoms of different elements contain negatively charged
constituents (electrons) that are identical for all atoms However, atoms on a
whole are electrically neutral Therefore, an atom must also contain some
positive charge to neutralise the negative charge of the electrons But what
is the arrangement of the positive charge and the electrons inside the atom |
9 | 2085-2088 | However, atoms on a
whole are electrically neutral Therefore, an atom must also contain some
positive charge to neutralise the negative charge of the electrons But what
is the arrangement of the positive charge and the electrons inside the atom In other words, what is the structure of an atom |
9 | 2086-2089 | Therefore, an atom must also contain some
positive charge to neutralise the negative charge of the electrons But what
is the arrangement of the positive charge and the electrons inside the atom In other words, what is the structure of an atom The first model of atom was proposed by J |
9 | 2087-2090 | But what
is the arrangement of the positive charge and the electrons inside the atom In other words, what is the structure of an atom The first model of atom was proposed by J J |
9 | 2088-2091 | In other words, what is the structure of an atom The first model of atom was proposed by J J Thomson in 1898 |
9 | 2089-2092 | The first model of atom was proposed by J J Thomson in 1898 According to this model, the positive charge of the atom is uniformly
distributed throughout the volume of the atom and the negatively charged
electrons are embedded in it like seeds in a watermelon |
9 | 2090-2093 | J Thomson in 1898 According to this model, the positive charge of the atom is uniformly
distributed throughout the volume of the atom and the negatively charged
electrons are embedded in it like seeds in a watermelon This model was
picturesquely called plum pudding model of the atom |
9 | 2091-2094 | Thomson in 1898 According to this model, the positive charge of the atom is uniformly
distributed throughout the volume of the atom and the negatively charged
electrons are embedded in it like seeds in a watermelon This model was
picturesquely called plum pudding model of the atom However
subsequent studies on atoms, as described in this chapter, showed that
the distribution of the electrons and positive charges are very different
from that proposed in this model |
9 | 2092-2095 | According to this model, the positive charge of the atom is uniformly
distributed throughout the volume of the atom and the negatively charged
electrons are embedded in it like seeds in a watermelon This model was
picturesquely called plum pudding model of the atom However
subsequent studies on atoms, as described in this chapter, showed that
the distribution of the electrons and positive charges are very different
from that proposed in this model We know that condensed matter (solids and liquids) and dense gases at
all temperatures emit electromagnetic radiation in which a continuous
distribution of several wavelengths is present, though with different
intensities |
9 | 2093-2096 | This model was
picturesquely called plum pudding model of the atom However
subsequent studies on atoms, as described in this chapter, showed that
the distribution of the electrons and positive charges are very different
from that proposed in this model We know that condensed matter (solids and liquids) and dense gases at
all temperatures emit electromagnetic radiation in which a continuous
distribution of several wavelengths is present, though with different
intensities This radiation is considered to be due to oscillations of atoms
Chapter Twelve
ATOMS
Rationalised 2023-24
291
Atoms
and molecules, governed by the interaction of each atom or
molecule with its neighbours |
9 | 2094-2097 | However
subsequent studies on atoms, as described in this chapter, showed that
the distribution of the electrons and positive charges are very different
from that proposed in this model We know that condensed matter (solids and liquids) and dense gases at
all temperatures emit electromagnetic radiation in which a continuous
distribution of several wavelengths is present, though with different
intensities This radiation is considered to be due to oscillations of atoms
Chapter Twelve
ATOMS
Rationalised 2023-24
291
Atoms
and molecules, governed by the interaction of each atom or
molecule with its neighbours In contrast, light emitted from
rarefied gases heated in a flame, or excited electrically in a
glow tube such as the familiar neon sign or mercury vapour
light has only certain discrete wavelengths |
9 | 2095-2098 | We know that condensed matter (solids and liquids) and dense gases at
all temperatures emit electromagnetic radiation in which a continuous
distribution of several wavelengths is present, though with different
intensities This radiation is considered to be due to oscillations of atoms
Chapter Twelve
ATOMS
Rationalised 2023-24
291
Atoms
and molecules, governed by the interaction of each atom or
molecule with its neighbours In contrast, light emitted from
rarefied gases heated in a flame, or excited electrically in a
glow tube such as the familiar neon sign or mercury vapour
light has only certain discrete wavelengths The spectrum
appears as a series of bright lines |
9 | 2096-2099 | This radiation is considered to be due to oscillations of atoms
Chapter Twelve
ATOMS
Rationalised 2023-24
291
Atoms
and molecules, governed by the interaction of each atom or
molecule with its neighbours In contrast, light emitted from
rarefied gases heated in a flame, or excited electrically in a
glow tube such as the familiar neon sign or mercury vapour
light has only certain discrete wavelengths The spectrum
appears as a series of bright lines In such gases, the
average spacing between atoms is large |
9 | 2097-2100 | In contrast, light emitted from
rarefied gases heated in a flame, or excited electrically in a
glow tube such as the familiar neon sign or mercury vapour
light has only certain discrete wavelengths The spectrum
appears as a series of bright lines In such gases, the
average spacing between atoms is large Hence, the
radiation emitted can be considered due to individual atoms
rather than because of interactions between atoms or
molecules |
9 | 2098-2101 | The spectrum
appears as a series of bright lines In such gases, the
average spacing between atoms is large Hence, the
radiation emitted can be considered due to individual atoms
rather than because of interactions between atoms or
molecules In the early nineteenth century it was also established
that each element is associated with a characteristic
spectrum of radiation, for example, hydrogen always gives
a set of lines with fixed relative position between the lines |
9 | 2099-2102 | In such gases, the
average spacing between atoms is large Hence, the
radiation emitted can be considered due to individual atoms
rather than because of interactions between atoms or
molecules In the early nineteenth century it was also established
that each element is associated with a characteristic
spectrum of radiation, for example, hydrogen always gives
a set of lines with fixed relative position between the lines This fact suggested an intimate relationship between the
internal structure of an atom and the spectrum of
radiation emitted by it |
9 | 2100-2103 | Hence, the
radiation emitted can be considered due to individual atoms
rather than because of interactions between atoms or
molecules In the early nineteenth century it was also established
that each element is associated with a characteristic
spectrum of radiation, for example, hydrogen always gives
a set of lines with fixed relative position between the lines This fact suggested an intimate relationship between the
internal structure of an atom and the spectrum of
radiation emitted by it In 1885, Johann Jakob Balmer
(1825 – 1898) obtained a simple empirical formula which
gave the wavelengths of a group of lines emitted by atomic
hydrogen |
9 | 2101-2104 | In the early nineteenth century it was also established
that each element is associated with a characteristic
spectrum of radiation, for example, hydrogen always gives
a set of lines with fixed relative position between the lines This fact suggested an intimate relationship between the
internal structure of an atom and the spectrum of
radiation emitted by it In 1885, Johann Jakob Balmer
(1825 – 1898) obtained a simple empirical formula which
gave the wavelengths of a group of lines emitted by atomic
hydrogen Since hydrogen is simplest of the elements
known, we shall consider its spectrum in detail in this
chapter |
9 | 2102-2105 | This fact suggested an intimate relationship between the
internal structure of an atom and the spectrum of
radiation emitted by it In 1885, Johann Jakob Balmer
(1825 – 1898) obtained a simple empirical formula which
gave the wavelengths of a group of lines emitted by atomic
hydrogen Since hydrogen is simplest of the elements
known, we shall consider its spectrum in detail in this
chapter Ernst Rutherford (1871–1937), a former research
student of J |
9 | 2103-2106 | In 1885, Johann Jakob Balmer
(1825 – 1898) obtained a simple empirical formula which
gave the wavelengths of a group of lines emitted by atomic
hydrogen Since hydrogen is simplest of the elements
known, we shall consider its spectrum in detail in this
chapter Ernst Rutherford (1871–1937), a former research
student of J J |
9 | 2104-2107 | Since hydrogen is simplest of the elements
known, we shall consider its spectrum in detail in this
chapter Ernst Rutherford (1871–1937), a former research
student of J J Thomson, was engaged in experiments on
a-particles emitted by some radioactive elements |
9 | 2105-2108 | Ernst Rutherford (1871–1937), a former research
student of J J Thomson, was engaged in experiments on
a-particles emitted by some radioactive elements In 1906,
he proposed a classic experiment of scattering of these
a-particles by atoms to investigate the atomic structure |
9 | 2106-2109 | J Thomson, was engaged in experiments on
a-particles emitted by some radioactive elements In 1906,
he proposed a classic experiment of scattering of these
a-particles by atoms to investigate the atomic structure This experiment was later performed around 1911 by Hans
Geiger (1882–1945) and Ernst Marsden (1889–1970, who
was 20 year-old student and had not yet earned his
bachelor’s degree) |
9 | 2107-2110 | Thomson, was engaged in experiments on
a-particles emitted by some radioactive elements In 1906,
he proposed a classic experiment of scattering of these
a-particles by atoms to investigate the atomic structure This experiment was later performed around 1911 by Hans
Geiger (1882–1945) and Ernst Marsden (1889–1970, who
was 20 year-old student and had not yet earned his
bachelor’s degree) The details are discussed in Section
12 |
9 | 2108-2111 | In 1906,
he proposed a classic experiment of scattering of these
a-particles by atoms to investigate the atomic structure This experiment was later performed around 1911 by Hans
Geiger (1882–1945) and Ernst Marsden (1889–1970, who
was 20 year-old student and had not yet earned his
bachelor’s degree) The details are discussed in Section
12 2 |
9 | 2109-2112 | This experiment was later performed around 1911 by Hans
Geiger (1882–1945) and Ernst Marsden (1889–1970, who
was 20 year-old student and had not yet earned his
bachelor’s degree) The details are discussed in Section
12 2 The explanation of the results led to the birth of
Rutherford’s planetary model of atom (also called the
nuclear model of the atom) |
9 | 2110-2113 | The details are discussed in Section
12 2 The explanation of the results led to the birth of
Rutherford’s planetary model of atom (also called the
nuclear model of the atom) According to this the entire
positive charge and most of the mass of the atom is
concentrated in a small volume called the nucleus with electrons revolving
around the nucleus just as planets revolve around the sun |
9 | 2111-2114 | 2 The explanation of the results led to the birth of
Rutherford’s planetary model of atom (also called the
nuclear model of the atom) According to this the entire
positive charge and most of the mass of the atom is
concentrated in a small volume called the nucleus with electrons revolving
around the nucleus just as planets revolve around the sun Rutherford’s nuclear model was a major step towards how we see
the atom today |
9 | 2112-2115 | The explanation of the results led to the birth of
Rutherford’s planetary model of atom (also called the
nuclear model of the atom) According to this the entire
positive charge and most of the mass of the atom is
concentrated in a small volume called the nucleus with electrons revolving
around the nucleus just as planets revolve around the sun Rutherford’s nuclear model was a major step towards how we see
the atom today However, it could not explain why atoms emit light of
only discrete wavelengths |
9 | 2113-2116 | According to this the entire
positive charge and most of the mass of the atom is
concentrated in a small volume called the nucleus with electrons revolving
around the nucleus just as planets revolve around the sun Rutherford’s nuclear model was a major step towards how we see
the atom today However, it could not explain why atoms emit light of
only discrete wavelengths How could an atom as simple as hydrogen,
consisting of a single electron and a single proton, emit a complex
spectrum of specific wavelengths |
9 | 2114-2117 | Rutherford’s nuclear model was a major step towards how we see
the atom today However, it could not explain why atoms emit light of
only discrete wavelengths How could an atom as simple as hydrogen,
consisting of a single electron and a single proton, emit a complex
spectrum of specific wavelengths In the classical picture of an atom, the
electron revolves round the nucleus much like the way a planet revolves
round the sun |
9 | 2115-2118 | However, it could not explain why atoms emit light of
only discrete wavelengths How could an atom as simple as hydrogen,
consisting of a single electron and a single proton, emit a complex
spectrum of specific wavelengths In the classical picture of an atom, the
electron revolves round the nucleus much like the way a planet revolves
round the sun However, we shall see that there are some serious
difficulties in accepting such a model |
9 | 2116-2119 | How could an atom as simple as hydrogen,
consisting of a single electron and a single proton, emit a complex
spectrum of specific wavelengths In the classical picture of an atom, the
electron revolves round the nucleus much like the way a planet revolves
round the sun However, we shall see that there are some serious
difficulties in accepting such a model 12 |
9 | 2117-2120 | In the classical picture of an atom, the
electron revolves round the nucleus much like the way a planet revolves
round the sun However, we shall see that there are some serious
difficulties in accepting such a model 12 2 ALPHA-PARTICLE SCATTERING AND
RUTHERFORD’S NUCLEAR MODEL OF ATOM
At the suggestion of Ernst Rutherford, in 1911, H |
9 | 2118-2121 | However, we shall see that there are some serious
difficulties in accepting such a model 12 2 ALPHA-PARTICLE SCATTERING AND
RUTHERFORD’S NUCLEAR MODEL OF ATOM
At the suggestion of Ernst Rutherford, in 1911, H Geiger and E |
9 | 2119-2122 | 12 2 ALPHA-PARTICLE SCATTERING AND
RUTHERFORD’S NUCLEAR MODEL OF ATOM
At the suggestion of Ernst Rutherford, in 1911, H Geiger and E Marsden
performed some experiments |
9 | 2120-2123 | 2 ALPHA-PARTICLE SCATTERING AND
RUTHERFORD’S NUCLEAR MODEL OF ATOM
At the suggestion of Ernst Rutherford, in 1911, H Geiger and E Marsden
performed some experiments In one of their experiments, as shown in
Ernst Rutherford (1871 –
1937) New Zealand born,
British physicist who did
pioneering
work
on
radioactive radiation |
9 | 2121-2124 | Geiger and E Marsden
performed some experiments In one of their experiments, as shown in
Ernst Rutherford (1871 –
1937) New Zealand born,
British physicist who did
pioneering
work
on
radioactive radiation He
discovered alpha-rays and
beta-rays |
9 | 2122-2125 | Marsden
performed some experiments In one of their experiments, as shown in
Ernst Rutherford (1871 –
1937) New Zealand born,
British physicist who did
pioneering
work
on
radioactive radiation He
discovered alpha-rays and
beta-rays Along
with
Federick Soddy, he created
the modern theory of
radioactivity |
9 | 2123-2126 | In one of their experiments, as shown in
Ernst Rutherford (1871 –
1937) New Zealand born,
British physicist who did
pioneering
work
on
radioactive radiation He
discovered alpha-rays and
beta-rays Along
with
Federick Soddy, he created
the modern theory of
radioactivity He studied
the ‘emanation’ of thorium
and discovered a new noble
gas, an isotope of radon,
now known as thoron |
9 | 2124-2127 | He
discovered alpha-rays and
beta-rays Along
with
Federick Soddy, he created
the modern theory of
radioactivity He studied
the ‘emanation’ of thorium
and discovered a new noble
gas, an isotope of radon,
now known as thoron By
scattering alpha-rays from
the
metal
foils,
he
discovered the atomic
nucleus and proposed the
plenatery model of the
atom |
9 | 2125-2128 | Along
with
Federick Soddy, he created
the modern theory of
radioactivity He studied
the ‘emanation’ of thorium
and discovered a new noble
gas, an isotope of radon,
now known as thoron By
scattering alpha-rays from
the
metal
foils,
he
discovered the atomic
nucleus and proposed the
plenatery model of the
atom He also estimated the
approximate size of the
nucleus |
9 | 2126-2129 | He studied
the ‘emanation’ of thorium
and discovered a new noble
gas, an isotope of radon,
now known as thoron By
scattering alpha-rays from
the
metal
foils,
he
discovered the atomic
nucleus and proposed the
plenatery model of the
atom He also estimated the
approximate size of the
nucleus ERNST RUTHERFORD (1871 – 1937)
Rationalised 2023-24
Physics
292
Fig |
9 | 2127-2130 | By
scattering alpha-rays from
the
metal
foils,
he
discovered the atomic
nucleus and proposed the
plenatery model of the
atom He also estimated the
approximate size of the
nucleus ERNST RUTHERFORD (1871 – 1937)
Rationalised 2023-24
Physics
292
Fig 12 |
9 | 2128-2131 | He also estimated the
approximate size of the
nucleus ERNST RUTHERFORD (1871 – 1937)
Rationalised 2023-24
Physics
292
Fig 12 1, they directed a beam of
5 |
9 | 2129-2132 | ERNST RUTHERFORD (1871 – 1937)
Rationalised 2023-24
Physics
292
Fig 12 1, they directed a beam of
5 5 MeV a-particles emitted from a
214
83Bi radioactive source at a thin metal
foil made of gold |
9 | 2130-2133 | 12 1, they directed a beam of
5 5 MeV a-particles emitted from a
214
83Bi radioactive source at a thin metal
foil made of gold Figure 12 |
9 | 2131-2134 | 1, they directed a beam of
5 5 MeV a-particles emitted from a
214
83Bi radioactive source at a thin metal
foil made of gold Figure 12 2 shows a
schematic diagram of this experiment |
9 | 2132-2135 | 5 MeV a-particles emitted from a
214
83Bi radioactive source at a thin metal
foil made of gold Figure 12 2 shows a
schematic diagram of this experiment Alpha-particles emitted by a 214
83Bi
radioactive source were collimated into
a narrow beam by their passage
through lead bricks |
9 | 2133-2136 | Figure 12 2 shows a
schematic diagram of this experiment Alpha-particles emitted by a 214
83Bi
radioactive source were collimated into
a narrow beam by their passage
through lead bricks The beam was
allowed to fall on a thin foil of gold of
thickness 2 |
9 | 2134-2137 | 2 shows a
schematic diagram of this experiment Alpha-particles emitted by a 214
83Bi
radioactive source were collimated into
a narrow beam by their passage
through lead bricks The beam was
allowed to fall on a thin foil of gold of
thickness 2 1 × 10–7 m |
9 | 2135-2138 | Alpha-particles emitted by a 214
83Bi
radioactive source were collimated into
a narrow beam by their passage
through lead bricks The beam was
allowed to fall on a thin foil of gold of
thickness 2 1 × 10–7 m The scattered
alpha-particles were observed through
a rotatable detector consisting of zinc
sulphide screen and a microscope |
9 | 2136-2139 | The beam was
allowed to fall on a thin foil of gold of
thickness 2 1 × 10–7 m The scattered
alpha-particles were observed through
a rotatable detector consisting of zinc
sulphide screen and a microscope The
scattered alpha-particles on striking
the screen produced brief light flashes
or scintillations |
9 | 2137-2140 | 1 × 10–7 m The scattered
alpha-particles were observed through
a rotatable detector consisting of zinc
sulphide screen and a microscope The
scattered alpha-particles on striking
the screen produced brief light flashes
or scintillations These flashes may be
viewed through a microscope and the
distribution of the number of scattered
particles may be studied as a function
of angle of scattering |
9 | 2138-2141 | The scattered
alpha-particles were observed through
a rotatable detector consisting of zinc
sulphide screen and a microscope The
scattered alpha-particles on striking
the screen produced brief light flashes
or scintillations These flashes may be
viewed through a microscope and the
distribution of the number of scattered
particles may be studied as a function
of angle of scattering FIGURE 12 |
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