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The potential difference that must be ap...

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface , having work function `5.01 eV` , when ultraviolet light of `200 nm` falls on it , must be

A

2.4 V

B

– 1.2 V

C

) – 2.4 V

D

1.2 V

Text Solution

Verified by Experts

The correct Answer is:
B
`hv=phi_(0)+eV_(0)` where `hv=(12400)/(2000)=6.2eV`
`implies V_(0)=6.2-5.01=1.19~~1.20V`
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