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NCERT CBSE CLASS 12 PHYSICS CHAPTER WISE MCQ

Welcome to your Chapter 11 Dual Nature of Radiation and Matter MCQs

1. 
How many types of electron emissions exist?
2. 
Which of the following are quick electron emissions?
3. 
Which radiations will be most effective for the emission of electrons from a metallic surface?
4. 
If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons?
5. 
What is the frequency of a photon whose energy is 66.3 eV?
6. 
Two metals A and B have work functions 4 eV and 10 eV respectively. Which metal has a higher threshold wavelength?
7. 
Identify the conclusion of the photoelectric experiment from the following.
8. 
Which of the following increases the maximum kinetic energy of the photoelectrons emitted?
9. 
Why does light travel as a wave?
10. 
Which theory of light is wave theory or particle theory?
11. 
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?
12. 
If the frequency of the incident radiation is equal to the threshold frequency, what will be the value of the stopping potential?
13. 
The maximum kinetic energy of a photoelectron is 3 eV. What is the stopping potential?
14. 
How does retarding potential vary with the frequency of light causing photoelectric effect?
15. 
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?
16. 
The best metal to be used for photoemission is:
17. 
The frequency and the intensity of a beam of light falling on the surface of photoelectric material are increased by a factor of two. This will:
18. 
Which of the following is not the property of photons?
19. 
When light is directed at the metal surface, the emitted electrons:
20. 
The wavelength associated with n electron is 1Å. The potential difference required for accelerating it is

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