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Light of frequency 1.5 times the thresho...

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

A

Four times

B

One - fourth

C

Zero

D

Doubled

Text Solution

Verified by Experts

The correct Answer is:
C
`v = (3)/(2)v_(0)`
frequency is halved
`therefore v. = (v)/(2) = (3)/(4) v_(0)`
Hence `v. lt v_(0)`
`v_(0)` is threshold frequency
So, no photoelectric emission will take place
Hence photoelectric current = zero.
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  • Light of frequency 1.5 times the threshold frequency is incident on a photo-sensitive material. If the frequency is halved and the intensity is doubled, the photoelectric current becomes

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