. The threshold frequency for a metallic surface corresponds to an energy

of 6.2 eV and the stopping potential for a radiation incident on this surface is 5 V. The incident radiation lies in

A. X-ray region

B. ultra-violet region

C. infra-red region

D. visible region

Best Answer

Ans: B

Sol: Given that the threshold frequency for metal surface corresponds to an energy = 6.2 eV

Stopping potential for the radiation incident on it is, Vo = 5V

We know that in the photoelectric experiment


Which is under the ultraviolet region.


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