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Light of frequeny 1.5 times the threshol...

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

A

One-fourth

B

Doubled

C

Halved

D

Zero

Text Solution

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The correct Answer is:
D
Incident frequency ,v=1.5
The frequency of incident light is halved ,
i.e `v_(1)=(1.5)/(2)=0.75`
Since the new frequency is less than the original frequency (i.e,`v_(1)gtv)`themission of photoelectrons graudally decreases resulting in a zero photo electric current .
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