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NEET PhysicsMedium

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

A

doubled

B

four times

C

one-fourth

D

zero

Step-by-Step Solution

Given ν=1.5ν0\nu = 1.5 \nu_0. If frequency is halved, ν′=ν2=1.5ν02=0.75ν0\nu' = \frac{\nu}{2} = \frac{1.5 \nu_0}{2} = 0.75 \nu_0. Since ν′<ν0\nu' < \nu_0, no photoelectric emission will take place.

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