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Light of wavelength A which is less than...

Light of wavelength A which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity, then stopping potential will

A

increase

B

decrease

C

be zero

D

become exactly half

Text Solution

Verified by Experts

The correct Answer is:
A
`(1)/(2)b=mv_(max)^(2)proph(v-v_(0))`
`i.e.,eV_(s)prophc((1)/(lamda)-(1)/(lamda_(0)))`
`:.V_(s)prop((1)/(lamda)-(1)/(lamda_(0)))`
Thus, if wavelength decreases stopping potential increases.
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