First slide

Photoelectric effect and study of photoelectric effect

Question

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 2m away, the electrons crossing the photocell

Moderate

A

each carry one-quarter of their previous momentum
B

each carry one-quarter of their pervious energy
C

are one-quarter as numerous
D

are half as numerous

Solution

$I \propto 1 / d^{2}$
when source is placed 2 m away, then $I^{'} = (I / 4)$ . The number of electrons emitted $\propto$ intensity. Hence, the number of emitted electrons is reduced to one-fourth.

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