When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of :-

Infrared ray

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X-rays

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Radio wave

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Light wave

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Solution

The correct option is B X-rays
When ultraviolet rays are incident on the metal plate and photoelectric effect does not occur, It means that the threshold frequency is greater than the frequency of ultra-violet rays. X-rays have extremely higher frequencies compared to that of ultra-violet rays. For photoelectric effect, the frequency of the incident light must be greater than the threshold frequency of the metal. Hence, when X-rays are incident, photoelectric emission happens.
The correct option is B.

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