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The threshold frequency for a photosensi...

The threshold frequency for a photosensitive metal is `3.3 xx 10^(14) Hz`. If a light of frequency `8.2 xx 10^(14)Hz` is incident on this metal, the cut-off voltage for the photoelectron emission is nearly.

A

1V

B

2V

C

3V

D

5V

Text Solution

Verified by Experts

The correct Answer is:
B
According to Einstein's equation
`eV_(0) = hf - hf_(0)`
`:. V_(0) = (h)/(e) (f - f_(0))`
`= (6.63 xx 10^(-34))/(1.6 xx 10^(-19)) (8.2 xx 3.3) xx 10^(14) ~~ 2V`
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