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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
According to photoelectric equation, `(hc)/(lamda)=phi+E`
If E is constant, then
`(1)/(lamda)prop phi`
If we decrease the wavelength `lamd`, then stopping potential `phi` will increase such that `(hc)/(lamda)-phi`=constant.
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