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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

2.4V

B

`-1.2V`

C

`-2.4 V`

D

1.2 V

Text Solution

Verified by Experts

The correct Answer is:
D
`K_(max) = (hc)/(lamda) - W = (hc)/(lamda) - 5.01 `
` = (12375)/(2000) -5.01 = 6.1875 - 5.01 = 1.17775 = 1.2 V`
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