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Class 12 Physics: Dual Nature of Radiation and Matter
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MCQs on electron emission, photoelectric effect and its experimental studies, light photoelectric and wave theories, einstein photoelectric equations, photon, matter wave nature, davisson and germer experiments.

Class 12 Physics: Dual Nature of Radiation and Matter
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25 Questions

1. Pick out the apparatus used in the experiment of the photoelectric effect from the following.
2. Which theory of light is wave theory or particle theory?
3. The maximum kinetic energy of a photoelectron is 3 eV. What is the stopping potential?
4. Which principle suggests that the intensity of light determines its amplitude?
5. What will be the number of photons emitted per second, if the power of the radio transmitter is 15 kW and it operates at a frequency of 700 kHz?
6. Which of the following is used in the Davisson – Germer experiment?
7. Give the unit of work function.
8. What will be the de – Broglie wavelength when the kinetic energy of the electron increases by 5 times?
9. What will be the photon energy for a wavelength of 5000 angstroms, if the energy of a photon corresponding to a wavelength of 7000 angstroms is 4.23 × 10-19 J?
10. What type of nature do electromagnetic waves have?
11. Among the following four spectral regions, in which of them, the photon has the highest energy in?
12. What is the frequency of a photon whose energy is 66.3 eV?
13. What is the de – Broglie wavelength of a ball of mass 150 g moving at a speed of 50 m/s?
14. What is the energy of a photon of wavelength λ?
15. Why are alkali metals most suited as photo-sensitive metals?
16. Which of the following increases the maximum kinetic energy of the photoelectrons emitted?
17. The magnitude of which of the following is proportional to the frequency of the wave?
18. Photons of energy 10.25 eV fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 5.0 eV. What is the stopping voltage required for these electrons?
19. Which theory of light explains the photoelectric effect?
20. Find the odd one out.
21. Calculate the energy of a photon of wavelength 6600 angstroms.
22. Who is responsible for the photoelectric effect experiment?
23. Identify the expression for Bragg's law from the following.
24. Which photon is more energetic: A red one or a violet one?
25. Which among the following shows the particle nature of light?

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