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A stopping potential of 0.82 volt is req...

A stopping potential of 0.82 volt is required to stop the photoelectrons emitted from a metallic surface by light of wavelength `4000 Å`. The stopping potential for wavelength `3000 Å` will be :

A

1.85 V

B

2.85 V

C

3.0 V

D

4.1 V.

Text Solution

Verified by Experts

The correct Answer is:
A
`0.82eV=(12375)/(4000)-phi_(0)`
`:. Phi_(0)=2*27eV`
Also `eV_(S)=(12375)/(3000)-2.27`
Then `V_(S)=1*85V`.
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