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:

  1. (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.