Question

Statement - 1 : When ultraviolet light is incident on a photocell , its stopping potential is `V_(0)` and the maximum kinetic energy of the photoelectrons is `K_(max)` when the ultraviolet light is replaces by X- rays both `V_(0) and K_(max)`increase
Statement - 2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value became of the range of frequencies present in the incident light
A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explanation for Statement -1
C. Statement-1 is False , Statement-2 is True
D. Statement -1 is true, Statement-2 is false

Answer 1

Correct Answer - D
Energy of X-rays photon is greater then ultraviolet photon.
So, `V_(0)` and `K_(max)` increases.
Electrons have speed ranging from `0` to maximum, because before emitting a large number of collisions take palce and energy is losst in collision.