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A cesium photocell with a steady potential difference of 60 V across it is illuminated by a small bright light placed 1 m away. When the same light is placed 2 m away, the electrons crossing the photocell -

Option: 1

each carry one-quarter of their previous momentum


Option: 2

each carry one-quarter of their previous energy


Option: 3

are one-quarter as numerous


Option: 4

are half as numerous


Answers (1)

best_answer

\begin{aligned} & i \propto \frac{1}{\mathrm{r}^2} \\ & \frac{i_2}{i_1}=\left(\frac{\mathrm{r}_1}{\mathrm{r}_2}\right)^2=\left(\frac{1}{2}\right)^2=\frac{1}{4} \\ & i_2=\frac{i_1}{4} \\ & \mathrm{n}_2=\frac{\mathrm{n}_1}{4} \end{aligned}

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