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Question

The threshold frequency for a certain photosensitive metal is ν0. When it is illuminated by light of frequency ν=2ν0, the stopping potential for photoelectric current isV0. What will be the stopping potential when the same metal is illuminated by light of frequency ν=3ν0?

A
1.5V0
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B
2V0
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C
2.5V0
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D
3V0
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Solution

The correct option is B 2V0
For light of frequency 2v0, we have 2hν0=hν0+eV0hν0=eV0 .....(i)
For light of frequency 3v0, we have 3hν0=hν0+eV2hV0=eV .....(ii)
From (i) and (ii), we get V=2V0
Hence, the correct choice is (b).

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