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  • Question 1
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    Photons of frequency f is incident on a metal surface of threshold frequency f0   . The maximum K.E. of emitted photoelectrons is ​

  • Question 2
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    The photoelectric threshold frequency of a metal is f0 . When light of frequency 4f0 is incident on the metal, the maximum K.E. of the emitted electron is ​

  • Question 3
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    Sodium surface is illuminated by ultraviolet and visible radiation successively and the stopping potential determined. The stopping potential is

  • Question 4
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    Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material .If the frequency is halved and the intensity is doubled, the photoelectric current becomes ​

  • Question 5
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    Light of wavelength 4000  is incident on a metal of work function 3.2 x 10-19  J. What is the maximum kinetic energy of the emitted electron?​

  • Question 6
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    Light from a bulb is falling on a wooden table but no photo electrons are emitted as

  • Question 7
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    Photons of energy 6eV are incident on a potassium surface of a work function 2.1 eV. What is the stopping potential?​

  • Question 8
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    The energy of the incident photon is 20 eV and the work function of the photosensitive metal is 10 eV. What is the stopping potential?​

  • Question 9
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    Light of two different frequencies whose photons have energies of 1eV and 2.5 eV  respectively successively illuminate a metal of work function 0.5eV. The ratio of maximum speed of emitted electrons is ​

  • Question 10
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    A photo-sensitive material would emit electrons, if excited by photons beyond a threshold. To overcome the threshold, one would increase the:

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