Photoelectric Effect
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357717 When light of wavelength \(300\;nm\) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength \(600\;nm\) is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

1 \(1: 2\)
2 \(2: 1\)
3 \(4: 1\)
4 \(1: 4\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357718 The work function of a metal is \(1\,eV\). Light of wavelength \(3000\;\mathop A\limits^o \) is incident on this metal surface. The velocity of emitted photoelectrons will be

1 \(10\;m{s^{ - 1}}\)
2 \(1 \times {10^3}\;m{s^{ - 1}}\)
3 \(1 \times {10^4}\;m{s^{ - 1}}\)
4 \(1 \times {10^6}\;m{s^{ - 1}}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357719 Energy of the incident photon on the metal surface is \(3\;W\) and then \(5\;W\), where \(W\) is the work function for that metal. The ratio of velocities of emitted photoelectrons is

1 \(1: 4\)
2 \(1: 2\)
3 \(1: \sqrt{2}\)
4 \(1: 1\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357720 A beam of light has two wavelengths \(4972\mathop A\limits^o \) and \(6216\mathop A\limits^o \) with a total intensity of \(3.6 \times {10^{ - 3}}\;W\;{m^{ - 2}}\) equally distributed among the two wavelengths. The beam falls normally on an area of \(1\;c{m^2}\) of a clean metallic surface of work function \(2.3\,eV\). Assume that there is no loss of the light by reflection and that each capable photon ejects one electron. The number of photoelectrons liberated in \(2\;s\) is approximately:-

1 \(15 \times 10^{11}\)
2 \(6 \times 10^{11}\)
3 \(9 \times 10^{11}\)
4 \(11 \times 10^{11}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357717 When light of wavelength \(300\;nm\) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength \(600\;nm\) is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

1 \(1: 2\)
2 \(2: 1\)
3 \(4: 1\)
4 \(1: 4\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357718 The work function of a metal is \(1\,eV\). Light of wavelength \(3000\;\mathop A\limits^o \) is incident on this metal surface. The velocity of emitted photoelectrons will be

1 \(10\;m{s^{ - 1}}\)
2 \(1 \times {10^3}\;m{s^{ - 1}}\)
3 \(1 \times {10^4}\;m{s^{ - 1}}\)
4 \(1 \times {10^6}\;m{s^{ - 1}}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357719 Energy of the incident photon on the metal surface is \(3\;W\) and then \(5\;W\), where \(W\) is the work function for that metal. The ratio of velocities of emitted photoelectrons is

1 \(1: 4\)
2 \(1: 2\)
3 \(1: \sqrt{2}\)
4 \(1: 1\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357720 A beam of light has two wavelengths \(4972\mathop A\limits^o \) and \(6216\mathop A\limits^o \) with a total intensity of \(3.6 \times {10^{ - 3}}\;W\;{m^{ - 2}}\) equally distributed among the two wavelengths. The beam falls normally on an area of \(1\;c{m^2}\) of a clean metallic surface of work function \(2.3\,eV\). Assume that there is no loss of the light by reflection and that each capable photon ejects one electron. The number of photoelectrons liberated in \(2\;s\) is approximately:-

1 \(15 \times 10^{11}\)
2 \(6 \times 10^{11}\)
3 \(9 \times 10^{11}\)
4 \(11 \times 10^{11}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357717 When light of wavelength \(300\;nm\) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength \(600\;nm\) is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

1 \(1: 2\)
2 \(2: 1\)
3 \(4: 1\)
4 \(1: 4\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357718 The work function of a metal is \(1\,eV\). Light of wavelength \(3000\;\mathop A\limits^o \) is incident on this metal surface. The velocity of emitted photoelectrons will be

1 \(10\;m{s^{ - 1}}\)
2 \(1 \times {10^3}\;m{s^{ - 1}}\)
3 \(1 \times {10^4}\;m{s^{ - 1}}\)
4 \(1 \times {10^6}\;m{s^{ - 1}}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357719 Energy of the incident photon on the metal surface is \(3\;W\) and then \(5\;W\), where \(W\) is the work function for that metal. The ratio of velocities of emitted photoelectrons is

1 \(1: 4\)
2 \(1: 2\)
3 \(1: \sqrt{2}\)
4 \(1: 1\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357720 A beam of light has two wavelengths \(4972\mathop A\limits^o \) and \(6216\mathop A\limits^o \) with a total intensity of \(3.6 \times {10^{ - 3}}\;W\;{m^{ - 2}}\) equally distributed among the two wavelengths. The beam falls normally on an area of \(1\;c{m^2}\) of a clean metallic surface of work function \(2.3\,eV\). Assume that there is no loss of the light by reflection and that each capable photon ejects one electron. The number of photoelectrons liberated in \(2\;s\) is approximately:-

1 \(15 \times 10^{11}\)
2 \(6 \times 10^{11}\)
3 \(9 \times 10^{11}\)
4 \(11 \times 10^{11}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357717 When light of wavelength \(300\;nm\) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength \(600\;nm\) is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

1 \(1: 2\)
2 \(2: 1\)
3 \(4: 1\)
4 \(1: 4\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357718 The work function of a metal is \(1\,eV\). Light of wavelength \(3000\;\mathop A\limits^o \) is incident on this metal surface. The velocity of emitted photoelectrons will be

1 \(10\;m{s^{ - 1}}\)
2 \(1 \times {10^3}\;m{s^{ - 1}}\)
3 \(1 \times {10^4}\;m{s^{ - 1}}\)
4 \(1 \times {10^6}\;m{s^{ - 1}}\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357719 Energy of the incident photon on the metal surface is \(3\;W\) and then \(5\;W\), where \(W\) is the work function for that metal. The ratio of velocities of emitted photoelectrons is

1 \(1: 4\)
2 \(1: 2\)
3 \(1: \sqrt{2}\)
4 \(1: 1\)
PHXII11:DUAL NATURE OF RADIATION AND MATTER

357720 A beam of light has two wavelengths \(4972\mathop A\limits^o \) and \(6216\mathop A\limits^o \) with a total intensity of \(3.6 \times {10^{ - 3}}\;W\;{m^{ - 2}}\) equally distributed among the two wavelengths. The beam falls normally on an area of \(1\;c{m^2}\) of a clean metallic surface of work function \(2.3\,eV\). Assume that there is no loss of the light by reflection and that each capable photon ejects one electron. The number of photoelectrons liberated in \(2\;s\) is approximately:-

1 \(15 \times 10^{11}\)
2 \(6 \times 10^{11}\)
3 \(9 \times 10^{11}\)
4 \(11 \times 10^{11}\)