Question: Q. 15. Write three characteristic features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein’s equation. U [Delhi I, II, III 2016]
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Solution:
Ans. The three characteristic features which can’t be explained by wave theory are :
(i) Kinetic energy of emitted electrons are found to be independent of intensity of incident light.
(ii) Below a certain frequency (threshold) there is no photo-emission
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(iii) Spontaneous emission of photo-electrons. 1
[CBSE Marking Scheme 2016]
