The threshold frequency for a metallic s...

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

ultra-violet region

infra-red region

visible region

X-ray region

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The correct Answer is:

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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