Dual Nature of Radiation and Matter Class 12 MCQs Questions with Answers

1.  
The maximum energy of electrons released in a photocell is independent of

2. The photoelectric effect is based on the law of conservation of

3. A Proton and an a-particle have the same de Broglie wavelength. What is same for both of them?

4. Cathode rays were discovered by

5. In a photon-particle collision, the quantity that does not remain conserved is

6. The kinetic energy of an electron is 5 eV. Calculate the de broglie wavelength associated with it. (h = 6.6 × 10-34 Js, me = 9.1 × 10-31 kg)

7. The photo-electrons emitted from a metal surface are such that their velocity

8.  In photoelectric effect, the photocurrent

9.  In Einstein’s picture of Photoelectric emission, the photoelectric emission does not take place by

10. Einstein’s photoelectric equation states that
hν = W0 + Ek.
In this equation, Ek refers to the

11. Which of the following when falls on a metal will emit photoelectrons ?

12. In photoelectric effect, the number of photoelectrons emitted is proportional to

13. Photoelectric effect is the phenomenon in which

14. Two particles A1 and A2 of masses m1, m2(m1 > m2) have the same de Broglie wavelength. Then,

15. A discharge takes place between the two electrodes on applying the electric field to the gas in the discharge tube. The cause of this fluorescence was attributed to

16.  
When light is incident on a metal surface the maximum kinetic energy of emitted electrons

17. Which phenomenon best supports the theory that matter has a wave nature?

18. Which of the following metals is not sensitive to visible light?

19. Light of frequency 1.9 times the threshold frequency is incident on a photosensitive material. If the frequency is halved and intensity is doubled, the photocurrent becomes

20.  
Which of the following are quick electron emissions?