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Photoelectric Effect and WaveParticle Duality Physics - Photoelectric Effect and WaveParticle Duality

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 64 questions in this chapter.

Question types

Photoelectric Effect and WaveParticle Duality question types

64 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

64
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6
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5
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Sample Questions

Photoelectric Effect and WaveParticle Duality questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on and a saturation photocurrent is recorded. An electric field is switched on which has a vertically downward direction.
  • A
    The photocurrent will increase.
  • ✓
    The kinetic energy of the electrons will increase.
  • C
    The stopping potential will decrease.
  • D
    The threshold wavelength will increase.

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
The photocurrent in an experiment on photoelectric effect increases if:
  • ✓
    The intensity of the source is increased.
  • B
    The exposure time is increased.
  • C
    The intensity of the source is decreased.
  • D
    The exposure time is decreased.

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark
When stopping potential is applied in an experiment on photoelectric effect, no photocurrent is observed. This means that:
  • A
    The emission of photoelectrons is stopped.
  • ✓
    The photoelectrons are emitted but are reabsorbed by the emitter metal.
  • C
    The photoelectrons are accumulated near the collector plate.
  • D
    The photoelectrons are dispersed from the sides of the apparatus.

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
A photon of energy hv is absorbed by o free electron of a metal having work function $\varphi<\text{hv}.$
  • A
    The electron is sure to come out.
  • B
    The electron is sure to come out with a kinetic energy $\text{hv}-\varphi.$
  • C
    Either the electron does not come out or it comes out with a kinetic energy $\text{hv}-\varphi$ .
  • ✓
    It may come out with a kinetic energy less than $\text{hv}-\varphi.$

Answer: D.

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Q 5M.C.Q (1 Marks)1 Mark
A proton and an electron are accelerated by the same potential difference. Let $\lambda_\text{e}$ and $\lambda_\text{p}$ denote the de Broglie wavelengths of the electron and the proton respectively.
  • A
    $\lambda_\text{e}=\lambda_\text{p}.$
  • B
    $\lambda_\text{e}<\lambda_\text{p}.$
  • ✓
    $\lambda _\text{e}>\lambda_\text{p}.$
  • D
    The relation between $\lambda_\text{e}$, and $\lambda_\text{p}$ depends on the accelerating potential difference

Answer: C.

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Q 61 Marks Question1 Mark
A sphere of radius 1.00cm is placed in the path of a parallel beam of light of large aperture. The intensity of the light is $0.5W/cm^{-2}$. If the sphere completely absorbs the radiation falling on it, find the force exerted by the light beam on the sphere.
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Q 81 Marks Question1 Mark
The threshold wavelength of a metal is $\lambda_0.$ Light of wavelength slightly less $\tan \lambda_0.$ is incident on an insulated plate made of this metal. It is found that photoelectrons are emitted for some time and after that the emission stops. Explain.
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Q 91 Marks Question1 Mark
In an experiment on photoelectric effect, a photon is incident on an electron from one direction and the photoelectron is emitted almost in the opposite direction. Does this violate conservation of momentu?
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Q 101 Marks Question1 Mark
Consider the situation described in the previous problem. Show that the force on the sphere due to the light falling on it is the same even if the sphere is not perfectly absorbing.
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Q 112 Marks Questions2 Marks
Find the maximum kinetic energy of the photoelectrons ejected when light of wavelength 350nm is incident on a cesium surface. Work function of cesium = 1.9eV
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Q 122 Marks Questions2 Marks
A photographic film is coated with a silver bromide layer. When light fells on this film, silver bromide molecules dissociate end the film records the light there. A minimum of 0.6eV is needed to dissociate a silver bromide molecule. Find the maximum wavelength of light that can be recorded by the film.
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Q 132 Marks Questions2 Marks
An atom absorbs a photon of wavelength 500nm and emits another photon of wavelength 700nm. Find the net energy absorbed by the atom in the process.
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Q 152 Marks Questions2 Marks
A parallel beam of monochromatic light of wavelength 663nm is incident on a totally reflecting plane mirror. The angle of incidence is 60° and the number of photons striking the mirror per second is $1.0 × 10^{19}.$ Calculate the force exerted by the light beam on the mirror.
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Q 183 Marks Question3 Marks
A totally reflecting, small plane mirror placed horizontally faces a parallel beam of light, as shown in the figure. The mass of the mirror is 20g. Assume that there is no absorption in the lens and that 30% of the light emitted by the source goes through the lens. Find the power of the source needed to support the weight of the mirror. Take $g = 10m/s^2.$​​​​​​​
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Q 215 Marks Questions5 Marks
In an experiment on photoelectric effect, the stopping potential is measured for monochromatic light beams corresponding to different wavelengths. The data collected are 11s follows:
wavelength (nm) 350 400 450 500 550
stopping potential(V): 1.45 1.00 0.66 0.38 0.16
Plot the stopping potential against inverse of wavelength $\big(\frac{1}{\lambda}\big) $ on a graph paper and find
  1. The Planck constant,
  2. The work function of the emitter and.
  3. The threshold wavelength.
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Q 235 Marks Questions5 Marks
The electric field associated with a light wave is given by $\text{E}=\text{E}_0\sin[(1.57\times10^7\text{m}^{-1})(\text{x}-{\text{ct}})].$ Find the stopping potential when this light is used in an experiment on photoelectric effect with the emitter having work function 1.9eV.
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Q 245 Marks Questions5 Marks
When a metal plate is exposed to a monochromatic beam of light of wavelength 400nm, a negative potential of 1.1V is needed to stop the photocurrent. Find the threshold wavelength for the metal.
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Q 255 Marks Questions5 Marks
A horizontal cesium plate ($\phi$ = l.9 eV) is moved vertically downward at a constant speed u in a room full of radiation of wavelength 250 run and above. What should be the minimum value of u so that the vertically upward component of velocity is nonpositive for each photoelectron?
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Q 27Case study (4 Marks)4 Marks
A silver ball of radius 4.8cm is suspended by a thread in a vacuum chamber. Ultraviolet light of wavelength 200 run is incident on the ball for some time during which a total light energy of $1.0 \times 10^{-7}J$ falls on the surface. Assuming that on the average one photon out of every ten thousand is able to eject a photoelectron, find the electric potential et the surface of the bell assuming zero potential at infinity. What is the potential at the centre of the bell?
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