Electron Emission, Photo Electric Effect (Threshol Frequency Stopping Potential)
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Dual nature of radiation and Matter

142110 A cesium photocell, with a steady potential difference of $60 \mathrm{~V}$ across it, is illuminated by a bright point source of light $50 \mathrm{~cm}$ away. When the same light is placed $1 \mathrm{~m}$ away, the photoelectrons emitted from the cell:

1 are half as previous
2 are one quarter as previous
3 each carry one quarter of their previous energy
4 each carry one quarter of their previous momentum
Karnataka CET-2002
Dual nature of radiation and Matter

142111 The work function of aluminium is $4.125 \mathrm{eV}$. The cut off wavelength for photoelectric effect for aluminium is :

1 $150 \mathrm{~nm}$
2 $420 \mathrm{~nm}$
3 $200 \mathrm{~nm}$
4 $300 \mathrm{~nm}$
Karnataka CET-2001
Dual nature of radiation and Matter

142114 Stopping potential required to reduce the photoelectric current to zero

1 is directly proportional to wavelength of the incident radiation
2 increases uniformly with wavelength of the incident radiation
3 is directly proportional to frequency of the incident radiation
4 decreases uniformly with frequency of the incident radiation
J and K CET- 2006
Dual nature of radiation and Matter

142116 One mili watt of light of wavelength $4560 \AA$ is incident on a cesium surface of work function $1.9 \mathrm{eV}$. Given that quantum of efficiency of photoelectric emission is $0.5 \%$, Plank constant $h=6.62 \times 10^{-34} \mathrm{~J}$ sec, velocity of light
$=3 \times 10^{8} \mathrm{~m} / \mathrm{sec}$, the photoelectric current liberated is

1 $1.84 \times 10^{-6} \mathrm{amp}$
2 $1.84 \times 10^{-7} \mathrm{amp}$
3 $1.84 \times 10^{-5} \mathrm{amp}$
4 $1.84 \times 10^{-4} \mathrm{amp}$
J and K CET- 2001
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Dual nature of radiation and Matter

142110 A cesium photocell, with a steady potential difference of $60 \mathrm{~V}$ across it, is illuminated by a bright point source of light $50 \mathrm{~cm}$ away. When the same light is placed $1 \mathrm{~m}$ away, the photoelectrons emitted from the cell:

1 are half as previous
2 are one quarter as previous
3 each carry one quarter of their previous energy
4 each carry one quarter of their previous momentum
Karnataka CET-2002
Dual nature of radiation and Matter

142111 The work function of aluminium is $4.125 \mathrm{eV}$. The cut off wavelength for photoelectric effect for aluminium is :

1 $150 \mathrm{~nm}$
2 $420 \mathrm{~nm}$
3 $200 \mathrm{~nm}$
4 $300 \mathrm{~nm}$
Karnataka CET-2001
Dual nature of radiation and Matter

142114 Stopping potential required to reduce the photoelectric current to zero

1 is directly proportional to wavelength of the incident radiation
2 increases uniformly with wavelength of the incident radiation
3 is directly proportional to frequency of the incident radiation
4 decreases uniformly with frequency of the incident radiation
J and K CET- 2006
Dual nature of radiation and Matter

142116 One mili watt of light of wavelength $4560 \AA$ is incident on a cesium surface of work function $1.9 \mathrm{eV}$. Given that quantum of efficiency of photoelectric emission is $0.5 \%$, Plank constant $h=6.62 \times 10^{-34} \mathrm{~J}$ sec, velocity of light
$=3 \times 10^{8} \mathrm{~m} / \mathrm{sec}$, the photoelectric current liberated is

1 $1.84 \times 10^{-6} \mathrm{amp}$
2 $1.84 \times 10^{-7} \mathrm{amp}$
3 $1.84 \times 10^{-5} \mathrm{amp}$
4 $1.84 \times 10^{-4} \mathrm{amp}$
J and K CET- 2001
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Dual nature of radiation and Matter

142110 A cesium photocell, with a steady potential difference of $60 \mathrm{~V}$ across it, is illuminated by a bright point source of light $50 \mathrm{~cm}$ away. When the same light is placed $1 \mathrm{~m}$ away, the photoelectrons emitted from the cell:

1 are half as previous
2 are one quarter as previous
3 each carry one quarter of their previous energy
4 each carry one quarter of their previous momentum
Karnataka CET-2002
Dual nature of radiation and Matter

142111 The work function of aluminium is $4.125 \mathrm{eV}$. The cut off wavelength for photoelectric effect for aluminium is :

1 $150 \mathrm{~nm}$
2 $420 \mathrm{~nm}$
3 $200 \mathrm{~nm}$
4 $300 \mathrm{~nm}$
Karnataka CET-2001
Dual nature of radiation and Matter

142114 Stopping potential required to reduce the photoelectric current to zero

1 is directly proportional to wavelength of the incident radiation
2 increases uniformly with wavelength of the incident radiation
3 is directly proportional to frequency of the incident radiation
4 decreases uniformly with frequency of the incident radiation
J and K CET- 2006
Dual nature of radiation and Matter

142116 One mili watt of light of wavelength $4560 \AA$ is incident on a cesium surface of work function $1.9 \mathrm{eV}$. Given that quantum of efficiency of photoelectric emission is $0.5 \%$, Plank constant $h=6.62 \times 10^{-34} \mathrm{~J}$ sec, velocity of light
$=3 \times 10^{8} \mathrm{~m} / \mathrm{sec}$, the photoelectric current liberated is

1 $1.84 \times 10^{-6} \mathrm{amp}$
2 $1.84 \times 10^{-7} \mathrm{amp}$
3 $1.84 \times 10^{-5} \mathrm{amp}$
4 $1.84 \times 10^{-4} \mathrm{amp}$
J and K CET- 2001
For More Updates join with Us
Dual nature of radiation and Matter

142110 A cesium photocell, with a steady potential difference of $60 \mathrm{~V}$ across it, is illuminated by a bright point source of light $50 \mathrm{~cm}$ away. When the same light is placed $1 \mathrm{~m}$ away, the photoelectrons emitted from the cell:

1 are half as previous
2 are one quarter as previous
3 each carry one quarter of their previous energy
4 each carry one quarter of their previous momentum
Karnataka CET-2002
Dual nature of radiation and Matter

142111 The work function of aluminium is $4.125 \mathrm{eV}$. The cut off wavelength for photoelectric effect for aluminium is :

1 $150 \mathrm{~nm}$
2 $420 \mathrm{~nm}$
3 $200 \mathrm{~nm}$
4 $300 \mathrm{~nm}$
Karnataka CET-2001
Dual nature of radiation and Matter

142114 Stopping potential required to reduce the photoelectric current to zero

1 is directly proportional to wavelength of the incident radiation
2 increases uniformly with wavelength of the incident radiation
3 is directly proportional to frequency of the incident radiation
4 decreases uniformly with frequency of the incident radiation
J and K CET- 2006
Dual nature of radiation and Matter

142116 One mili watt of light of wavelength $4560 \AA$ is incident on a cesium surface of work function $1.9 \mathrm{eV}$. Given that quantum of efficiency of photoelectric emission is $0.5 \%$, Plank constant $h=6.62 \times 10^{-34} \mathrm{~J}$ sec, velocity of light
$=3 \times 10^{8} \mathrm{~m} / \mathrm{sec}$, the photoelectric current liberated is

1 $1.84 \times 10^{-6} \mathrm{amp}$
2 $1.84 \times 10^{-7} \mathrm{amp}$
3 $1.84 \times 10^{-5} \mathrm{amp}$
4 $1.84 \times 10^{-4} \mathrm{amp}$
J and K CET- 2001