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Monochromatic light of frequency f_{1} is incident on a photo cell and the stopping potential isfound to be V_{1} . What is the new stopping potential of the cell if it is radiated by monochromaticlight of frequency f_{2}  ?

Option: 1

V_1+\frac{h}{e}\left(f_2-f_1\right)


Option: 2

V_1+\frac{h}{e}\left[f_1+f_2\right]


Option: 3

V_1-\frac{h}{e}\left[f_1+f_2\right]


Option: 4

None


Answers (1)

best_answer

\begin{aligned} & e V_1=h f_1-\phi \\ & e V_2=h f_2-\phi \\ & e\left(V_1-V_2\right)=h\left(f_1-f_2\right) \end{aligned}
\begin{aligned} & V_1-V_2=\frac{h}{e}\left(f_1-f_2\right) \\ & V_2=V_1+\frac{h}{e}\left(f_2-f_1\right) \end{aligned}

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Ajit Kumar Dubey

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