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

1. 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

2. 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)

3. Photoelectric effect is the phenomenon in which

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

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

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

7. Cathode rays were discovered by

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

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

10.  In photoelectric effect, the photocurrent

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

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

13.  
Which of the following are quick electron emissions?

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

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

16.  
The maximum energy of electrons released in a photocell is independent of

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

18. 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

19.  
When light is incident on a metal surface the maximum kinetic energy of emitted electrons

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