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

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

2.  
Which of the following are quick electron emissions?

3. 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

4.  In photoelectric effect, the photocurrent

5. 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

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

7.  
The maximum energy of electrons released in a photocell is independent of

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

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

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

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

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

13. Cathode rays were discovered by

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

15. Photoelectric effect is the phenomenon in which

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

17.  
When light is incident on a metal surface the maximum kinetic energy of emitted electrons

18. 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)

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

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