A photoelectric cell is illuminated by a point source of light $1 m$ away. When the source is shifted to $2 m$ then -

each emitted electron carries one quarter of the initial energy

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number of electrons emitted is half the initial number

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each emitted electron carries half the initial energy

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number of electrons emitted is a quarter of the initial number

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Solution

The correct option is D number of electrons emitted is a quarter of the initial number
For a point source intensity I is directly proportional to $\frac{1}{r^{2}}$
As radius is doubled , intensity is quarter the previous value and the number of electrons emitted are also quarter the previous value

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A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2m then -

The correct option is D number of electrons emitted is a quarter of the initial numberFor a point source intensity I is directly proportional to 1r2As radius is doubled , intensity is quarter the previous value and the number of electrons emitted are also quarter the previous value

A photoelectric cell is illuminated by a point source of light $1 m$ away. When the source is shifted to $2 m$ then -

The correct option is D number of electrons emitted is a quarter of the initial number
For a point source intensity I is directly proportional to $\frac{1}{r^{2}}$
As radius is doubled , intensity is quarter the previous value and the number of electrons emitted are also quarter the previous value