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The threshold frequency for a metallic s...

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation on this surface is 5 V. The incident radiation lies in

A

ultra-violet region

B

infra-red region

C

visible region

D

X-ray region

Text Solution

Verified by Experts

The correct Answer is:
A
According to Einstein's theory of photoelectric effect
energy of incident photon `=W_(0)+eV_(0)`
`W_(0)=6.2 eV, eV_(0)=5 eV`
Energy of incident photon `=11.2 eV`
The wavelength corresponding to this energy is `110nm` which falls in the ultraviolet region.
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