First slide

Photo Electric Effect

Question

While studying, effect of variation of intensity on the photocurrent, intensity of light is changed in a photocell by

Easy

A

using a prism in the path of light beam
B

using a thick glass sheet
C

tilting the cathode
D

changing the distance of light source from the emitter

Solution

we know that in case of point source of radiation $I \propto \frac{1}{d^{2}}$
Hence by changing the distance of light source from emitter, we will change intensity

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