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The work function of a metallic surface ...

The work function of a metallic surface in 5.0/eV. Photoelectrons are emitted when light of `lamda=2000Å` falls-on it. The P.D. to stop fastest photoelectrons is :

A

1.2 V

B

2.4 V

C

3.6 V

D

4.8 V.

Text Solution

Verified by Experts

The correct Answer is:
A
`V=(hv-w)/(e)=(hc//lambda-w)/(e)`
`-1.2 V` on solving
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