A photo cell is illuminated by a small bright source placed $1$ m away. When the same source of light is placed $2$ m away, the electrons emitted by photo cathode.

Carry one quarter of their previous energy

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Carry one quarter of their previous momenta

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Are half as numerous

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Are one quarter as numerous

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Solution

The correct option is A Are one quarter as numerous
$I \propto (\frac{1}{d^{2}})$
When source is placed $2$ m away, then $I^{'} = I / 4$ .
The number of electrons emitted is directly proportional to intensity. Hence, number of emitted electrons is reduced to one-fourth.

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A photo cell is illuminated by a small bright source placed 1m away. When the same source of light is placed 2m away, the electrons emitted by photo cathode.

The correct option is A Are one quarter as numerousI∝(1d2)When source is placed 2m away, then I′=I/4.The number of electrons emitted is directly proportional to intensity. Hence, number of emitted electrons is reduced to one-fourth.

A photo cell is illuminated by a small bright source placed $1$ m away. When the same source of light is placed $2$ m away, the electrons emitted by photo cathode.

The correct option is A Are one quarter as numerous
$I \propto (\frac{1}{d^{2}})$
When source is placed $2$ m away, then $I^{'} = I / 4$ .
The number of electrons emitted is directly proportional to intensity. Hence, number of emitted electrons is reduced to one-fourth.