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A light source is at a distance d from a...

A light source is at a distance d from a photoelectric cell, then the number of photoelectrons emitted from the cell is n. If the distance of light source and cell is reduced to half, then the number of photoelectrons emitted will become

A

each carry one-quarter of their previous momentum

B

each carry one-quarter of their previous energy

C

are one-quarter as numerous

D

are half as numerous

Text Solution

Verified by Experts

The correct Answer is:
C
`Iprop(1)/(d^2)`
When source is placed 2 m away, the `I'=((I)/(4))`. The number of electrons emitted `prop` intensity. Hence, the number of emitted electrons is reduced to one-fourth.
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