Dual Nature of Radiation and Matter - Result Question 52
55. When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consists of
[2002]
(a) infra-red waves
(b) $X$-rays
(c) visible light rays
(d) radio waves
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Answer:
Correct Answer: 55. (b)
Solution:
- (b) Energy of photon of $X$-rays is more than energy of photon of ultraviolet rays. Because frequency of $X$ rays is more than ultraviolet rays.
(a) Einstein work on photoelectric effect supports the equation $E=h v$. It is based on quantum theory of light.
