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  • The threshold frequency for a photosensitive metal is 3.3 x 1014 Hz. If light of frequency 8.2 x 1014 Hz is incident on this metal, the cut-off voltage for the photoelectric e

The threshold frequency for a photosensitive metal is 3.3 x 1014 Hz. If light of frequency 8.2 x 1014 Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly

Option: 1

5 V


Option: 2

1 V


Option: 3

2 V


Option: 4

3 V


Answers (1)

best_answer

According to Einstein's photoelectric equation

\\ e V_{0}=h v-h v_{0} \\ where, \ v= Incident \ \ frequency \\ v_{0}= Threshold \ \ frequency \\ V_{0}= Cut-off \ \ or \ \ stopping \ \ potential \\ \quad V_{0}=\frac{h}{e}\left(v-v_{0}\right) \\ \text{Substituting the given values,} \\ we \ \ get \\ V_{0}=\frac{6.63 \times 10^{-34}\left(8.2 \times 10^{14}-3.3 \times 10^{14}\right)}{1.6 \times 10^{-19}} \approx 2 V

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HARSH KANKARIA

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