Question

Light frequency 1.5 times the threshold frequency is incident on photo sensitive material of the frequency is 1/2 and intensity become double.the photo electric current become....

Answer 1

Answer on Question #50750-Physics-Nuclear Physics

Light frequency 1.5 times the threshold frequency is incident on photo sensitive material. The frequency is 1/2 and intensity becomes double. The photo electric current becomes...

Solution

When the frequency of incident light is halved its value becomes less than the threshold frequency $(f' = \frac{1}{2} f = \frac{1}{2} \cdot 1.5 f_{\text{threshold}} = 0.75 \cdot f_{\text{threshold}} < f_{\text{threshold}})$ and the photo electric current stops i.e. becomes zero.

Answer: Zero.

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