When an 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 X - rays are are incident on the same cell, then

Options

A. `V_(0)` and `K_(max)` both increase
B. `V_(0)` and `K_(max)` both decrease
C. `V_(0)` increases but `K_(max)` remains the same
D. `K_(max)` increases but `V_(0)` remains the same

Answer

A

Explanation

The energy of X-ray is more that of `U.V`. Light. Hence, the `K.E.` of emitteed photoelectron is more and hence stopping potential required is also more.