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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

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The correct Answer is:
D
`k_(max) =(hc)/(lambda) - W = (hc)/(lambda) - 5 .0.1= (12375)/(lambda( "in" Å) ) - 5.01`
`= (12375)/( 2000) - 5.01 = 6.1875- 5.01 = 1.17775 ~= 1.2V`
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