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  • A cesium photocell, with a steady potential difference of across, is illuminated by a bright point source of light <i

A cesium photocell, with a steady potential difference of 60 V across, is illuminated by a bright point source of light 50cm away. When the same light is placed 1 m away, the photoelectrons emitted from the cell -

Option: 1

Are one quarter as numerous


Option: 2

Are half as numerous


Option: 3

Each carry one quarter of their previous momentum


Option: 4

Each carry one quarter of their previous energy


Answers (1)

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\begin{aligned} & \mathrm{d}_1=50 \mathrm{~cm} \\ & \mathrm{~d}_2=1 \mathrm{~m}=100 \mathrm{~cm} \\ & \mathrm{~d}_2=2 \mathrm{~d}_1\left(\mathrm{I} \propto \frac{1}{\mathrm{~d}^2}\right) \\ & \mathrm{I}_2=\mathrm{I}_1 / 4 \\ & \mathrm{n}_{\mathrm{Ph}_2}=\frac{\mathrm{n}_{\mathrm{Ph}_1}}{4} \\ & \mathrm{n}_{\mathrm{e}_2}=\frac{\mathrm{n}_{\mathrm{e}_1}}{4} \end{aligned}

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