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Question

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
1.2V
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B
2.4V
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C
1.2V
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D
2.4V
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Solution

The correct option is A 1.2V
From Einstein's photoelectric equation, eV0=hνW

Here, hν=hcλ=(6.62×1034)×(3×108)200×109=9.93×1019J and work function,W=5.01eV=5.01×1.6×1019J

Now, V0=hν/eW/e=9.93×10191.6×10195.01×1.6×10191.6×1019=1.2V

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