First slide

Photo Electric Effect

Question

Light of frequency 1.5 times the threshold frequency is incident on photo-sensitive material. If the frequency is halved and intensity is doubled, the photo current becomes

Easy

A

quadrupled
B

doubled
C

halved
D

zero

Solution

(4)
Suppose Threshold frequency is $ν_{0} .$ When the frequency of incident light is halved; it becomes $\frac{ν_{0}}{2}$ , which is less than threshold frequency. So no photo electron will be ejected.

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