Assertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function `= hf_(0)` where `f_(0)` is the threshold frequency.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

B

Explanation

(b) : Work function is the minimum energy required to eject the photoelectron from photosensitive metal.
Hence for metal to be photosensitive, the work function should be small.
Work function `=hv_(0)`, where `v_(0)` is the threshold frequency.