The graph given below showing the variation of stopping potential

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 Multiple Choice QuestionsMultiple Choice Questions

191.

Which of the following has same dimensions to that of Planck's constant?

  • Work

  • Energy

  • Linear momentum

  • Angular momentum


192.

When a light beam enters into water from air, then which of the following does not change?

  • Velocity

  • Frequency

  • Wavelength

  • Amplitude


193.

Speed of light in vacuum is

  • 1μ0ε0

  • μ0ε0

  • μ0ε0

  • ε0μ0


194.

Light of wavelength 488 nm is produced by organ 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 photoelectron is 0.38 V. Find the work function of the material from which the emitter is made.

  • 1.25 eV

  • 2.17 eV

  • 4.07 eV

  • 3.57 eV


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195.

The graph given below showing the variation of stopping potential with the frequency of incident radiation for two different photosensitive materials having work functions W1 and W( W1 < W2 ).

   

The slope of graph showing the variation of stopping potential with the frequency of incident radiation gives the value of

  • h/e where, h is Planck's constant and e electronic charge

  • h i.e, Planck's constant

  • e i.e, electronic charge

  • None of the above


A.

h/e where, h is Planck's constant and e electronic charge

The slope of graph showing the variation of stopping potential with the frequency of  incident radiation gives the value of h/e, where h is Planck's constant and e is electronic  charge whereas intercept of the lines gives the ratio of work function W and depend electronic charge e i.e. W/e.


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196.

The photoelectric threshold wavelength of silver is 3520 x 10-10 m. The velocity of the electron ejected from a silver surface by ultraviolet light ofwavelength 2536 x 10-10 m is (Given, h = 4.14 × 10-15 eV , c = 3 × 108 m/s)

  • 0.3 × 106 m/s

  • 0.6 ×105 m/s

  • 0.6 × 106 m/s

  • 61 × 103 m/s


197.

Light of wavelength λ , strikes a photoelectric surface and electrons are ejected with an energy E. If E is to be increased to exactly twice its original value, the wavelength changes to λ', where

  • λ' is less than λ2

  • λ' is greater than λ2

  • λ' is greater than λ2 but less than λ

  • λ' is exactly equal to λ2


198.

When a certain metal surface is illuminated with light of frequency v, the stopping potential for photoelectric current is V0. When the same surface is illuminated by light of frequency v2,the stopping potential is V04. The threshold frequency for photoelectric, emission is

  • v6

  • v3

  • 2v3

  • 4v3


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199.

For photoelectric emission from certain metal the cut-off frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximumpossible velocity of the emitted electron will be (m is the electron mass)

  • hv2m

  • hvm

  • 2hvm

  • 2hvm


200.

The wavelength λe of an electron and λp of a photon of same energy E are related by

  • λp ∝ λe2

  • λp ∝ λe

  • λp  λe

  • λp  1λe


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