Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be th

Question

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?

Accepted Answer

Given $
u = 1.5 
u_0$. If frequency is halved, $
u' = \frac{
u}{2} = \frac{1.5 
u_0}{2} = 0.75 
u_0$. Since $
u' < 
u_0$, no photoelectric emission will take place.

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