JEE Questions for Physics Dual Nature Of Radiation And Matter Quiz 10 - MCQExams.com

If wavelength of photon and electron is same then ratio of total energy of electron to total energy of photon would be

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The threshold wavelength for photoelectric emission from a material is 5200 Å. Photo-electrons will be emitted when this material is illuminated with monochromatic radiation from a
  • 50 watt infrared lamp
  • 1 watt infrared lamp
  • 50 watt ultraviolet lamp
  • 1 watt ultraviolet lamp
  • Both (c) and (d)
Photoelectric effect supports quantum nature of light because
(i) There is minimum frequency of light below which no photoelectrons are emitted
(ii) Electric charge of photoelectrons is quantized
(iii) Maximum kinetic energy of photoelectrons depends only on the frequency of light and not on its intensity
(iv) Even when metal surface is faintly illuminated the photoelectrons leave the surface immediately
  • (0, (ii), (iii)
  • (i), (ii), (iv)
  • (ii), (iii), (iv)
  • (i), (iii), (iv)
A photon creates a pair of electron-positron with equal kinetic energy. Let kinetic energy of each particle is 0.29 MeV. Then what should be energy of the photon
  • 1.60 MeV
  • 1.63 MeV
  • 2.0 MeV
  • 1.90 MeV
The threshold wavelength for photoelectric emission from a material is 4800 Å. Photoelectrons will be emitted from the material, when it is illuminated with light from a
  • 40 W blue lamp
  • 40 W green lamp
  • 100 W red lamp
  • 100 W yellow lamp
  • 1000 W green lamp
The photo-electrons emitted from a surface of sodium metal are such that
  • They all are of the same frequency
  • They have the same kinetic energy
  • They have the same de-Broglie wavelength
  • They have their speeds varying from zero to a certain maximum
A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photo-electrons is
  • 4.81 V
  • 3.74 V
  • 2.65 V
  • 1.07 V
A light whose frequency is equal to 6 ×1014 Hz is incident on a metal whose work function is 2 eV.
[h = 6.63 × 10–34 Js, 1eV = 1.6 × 10–19 J . The maximum energy of the electrons emitted will be
  • 2.49 eV
  • 4.49 eV
  • 0.49 eV
  • 5.49 eV
The retarding potential for having zero photo-electron current
  • Is proportional to the wavelength of incident light
  • Increases uniformaly with the increase in the wavelength of incident light
  • Is proportional to the frequency of incident light
  • Increases uniformly with the increase in the frequency of incident light wave
An electron microscope is used to probe the atomic arrangement to a resolution of 5 Å. What should be the electric potential to which the electrons need to be accelerated
  • 2.5 V
  • 6.25 V
  • 2.5 kV
  • 5 kV
The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ, for sodium is 5460 Å, the value of λ, for tungsten is
  • 5893 Å
  • 10683 Å
  • 2791 Å
  • 528 Å
A photon of energy 3.4 eV is incident on a metal having work function 2 eV. The maximum K.E. of photo-electrons is equal to
  • 1.4 eV
  • 1.7 eV
  • 5.4 eV
  • 6.8 eV

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In a photoelectric experiment for 4000 Å incident radiation, the potential difference to stop the ejection is 2V. If the incident light is changed to 3000 Å, then the potential required to stop the ejection of electrons will be
  • 2 V
  • Less than 2 V
  • Zero
  • Greater than 2 V
Photo cell is a device to
  • Store photons
  • Measure light intensity
  • Convert photon energy into mechanical energy
  • Store electrical energy for replacing storage batteries
If the work function for a certain metal is 3.2 × 10–19 joule and it is illuminated with light of frequency 8 × 1014 Hz. The maximum kinetic energy of the photoelectrons would be (h = 6.63 × 10–34 Js)
  • 2.1 × 10–19 J
  • 8.5 × 10–19 J
  • 5.3 × 10–19 J
  • 3.2 × 10–19 J
The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be
  • 12.4 eV
  • 6.2 eV
  • 100 eV
  • 200 eV
When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be
  • 0.3 V
  • 0.6 V
  • 1.2 V
  • 2.4 V
Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2V potential stops the emitted electrons. The work function of the material (in eV) is approximately (h = 6.6 × 10– 34 Js, e = 1.6 × 10– 19 C, c = 3 × 108 ms– 1)
  • 1.1
  • 2.0
  • 2.2
  • 3.1
Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is
  • 4
  • 1/4
  • 2
  • 1/2
Energy conversion in a photoelectric cell takes place from
  • Chemical to electrical
  • Magnetic to electrical
  • Optical to electrical
  • Mechanical to electrical
When a monochromatic point source of light is at a distance 0.2 m from a photoelectric cell, the saturation current and cut-off voltage are 12.0 mA and 0.5 V. If the same source is placed 0.4 m away from the photoelectric cell, then the saturation current and the stopping potential respectively are
  • 4 mA and 1 V
  • 12 mA and 1 V
  • 3 mA and 0.5 V
  • 12 mA and 0.5 V
The threshold wavelength for a metal having work function W0 is λ0. What is the threshold wavelength for a metal whose work function is W0 /2 ?
  • 4 λ0
  • 2 λ0
  • λ0/2
  • λ0/4
The time taken by a photoelectron to come out after the photon strikes is approximately
  • 10–10 s
  • 10–16 s
  • 10–1 s
  • 10–4 s
Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ\' where

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If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å, then
  • Stopping potential will decrease
  • Stopping potential will increase
  • Kinetic energy of emitted electrons will decrease
  • The value of work function will decrease
Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment?
  • Work function of the surface
  • Amount of photoelectric current
  • Stopping potential will be reduced
  • Maximum kinetic energy of photoelectrons
The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy of 6 eV fall on it is 4 eV. The stopping potential in volts is
  • 2
  • 4
  • 6
  • 10
Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface
  • 4000 Å, 7500 Å
  • 5500 Å, 6000 Å
  • 4000 Å, 6000 Å
  • None of these
Maximum velocity of the photoelectrons emitted by a metal surface is 1.2 ×106 ms–1. Assuming the specific charge of the electron to be 1.8 × 1011 Ckg–1, the value of the stopping potential in volt will be
  • 2
  • 3
  • 4
  • 6
The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is
  • Double the earlier value
  • Unchanged
  • More than doubled
  • Less than doubled
Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is
  • 15 J
  • 16 × 10–14 J
  • 4 × 10–19 J
  • 4 × 10–81 J
The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2 > W1). If the current before and after change are I1 and I2, all other conditions remaining unchanged, then (assuming hv > W2)
  • I1 = I2
  • I1 < I2
  • I1 > I2
  • I1 < I2 < 2I1
A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then

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Which is the incorrect statement of the following?
  • Photon is a particle with zero rest mass
  • Photon is a particle with zero momentum
  • Photons travel with velocity of light in vacuum
  • Photon even feel the pull of gravity
When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then
  • No electrons are emitted
  • Photons are emitted
  • Electrons of higher energy are emitted
  • Electrons of lower energy are emitted
The photoelectric threshold wavelength of a certain metal is 3000 Å. If the radiation of 2000 Å is incident on the metal
  • Electrons will be emitted
  • Positrons will be emitted
  • Protons will be emitted
  • Electrons will not be emitted
A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is
  • 2 eV
  • 2 J
  • 2 kJ
  • 2 keV
The work functions for sodium and copper are 2 eV and 4 eV. Which of them is suitable for a photocell with 4000 Å light?
  • Copper
  • Sodium
  • Both
  • Neither of them
For intensity I of a light of wavelength 5000 Å the photoelectron saturaiton current is 0.40 µA and stopping potential is 1.36 V, the work function of metal is
  • 2.47 eV
  • 1.36 eV
  • 1.10 eV
  • 0.43 eV
The work function of aluminium is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be
  • Possible
  • Not possible
  • Data is incomplete
  • Depends upon the density of the surface
In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become
  • Double
  • Half
  • Four times
  • No change
Light of frequency v is incident on a substance of threshold frequency v0(v0 < v). The energy of the emitted photoelectron will be
  • h (v – v0)
  • h /v
  • he (v – v0)
  • h /v0
The stopping potential (V0)
  • Depends upon the angle of incident light
  • Depends upon the intensity of incident light
  • Depends upon the surface nature of the substance
  • Is independent of the intensity of the incident light
When wavelength of incident photon is decreased then
  • Velocity of emitted photoelectron decreases
  • Velocity of emitted photoelectron increases
  • Velocity of photoelectron do not change
  • Photo electric current increases
Quantum nature of light is explained by which of the following phenomenon
  • Huygen wave theory
  • Photoelectric effect
  • Maxwell electromagnetic theory
  • de-Broglie theory
When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are v and 2v respectively. The work function of the metal is (h = Planck\'s constant, c = velocity of light in air)
  • 2 hc × 106 J
  • 1.5 hc × 106 J
  • hc × 106 J
  • 0.5 hc × 106 J
The incident photon involved in the photoelectric effect experiment
  • Completely disappears
  • Comes out with an increased frequency
  • Comes out with a decreased frequency
  • Comes out without change in frequency
If intensity of incident light is increased in PEE then which of the following is true
  • Maximum K. E. of ejected electron will increase
  • Work function will remain unchanged
  • Stopping potential will decrease
  • Maximum K. E. of ejected electron will decrease
Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
  • 0 eV
  • 1 eV
  • 2 eV
  • 10 eV
0:0:1


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