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

1.  
Which of the following are quick electron emissions?

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

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

4. 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)

5. Cathode rays were discovered by

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

7. 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

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

9.  
The maximum energy of electrons released in a photocell is independent of

10. Photoelectric effect is the phenomenon in which

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

12.  
When light is incident on a metal surface the maximum kinetic energy of emitted electrons

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

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

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

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

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

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

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.  In photoelectric effect, the photocurrent