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Class 12 Physics Practice Test: Dual Nature of Radiation and Matter
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Class 12 Physics Practice Test: Dual Nature of Radiation and Matter
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10 Questions

1. Calculate the kinetic energy of a photoelectron (in eV) emitted on shining light of wavelength 6.2 × 10-6 m on a metal surface. The work function of the metal is 0.1 eV.
2. How does retarding potential vary with the frequency of light causing photoelectric effect?
3. If the frequency of the incident radiation is equal to the threshold frequency, what will be the value of the stopping potential?
4. If the intensity of the radiation incident on a photo-sensitive plate is doubled, how does the stopping potential change?
5. The stopping potential in an experiment on the photoelectric effect is 1.5 V. What is the maximum kinetic energy of the photoelectrons emitted?
6. The maximum kinetic energy of a photoelectron is 3 eV. What is the stopping potential?
7. The stopping potential in photoelectric emission does not depend upon the frequency of the incident radiation.
8. For a photosensitive surface, the work function is 3.3 × 10-19 J. Calculate the threshold frequency.
9. Two beams, one of red light and the other of blue light, of the same intensity are incident on a metallic surface to emit photoelectrons. Which emits electrons of greater frequency?
10. If the intensity of incident radiation in a photo-cell is increased, how does the stopping potential vary?

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