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

Options

A. Four times
B. One - fourth
C. Zero
D. Doubled

Answer

C

Explanation

`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.