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 replaced by $X$-rays, both $V_0$ and $K_{max}$ increase.
Statement $-2$: Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

• A
  Statement $-1$ is true, Statement $-2$ is false.
• B
  Statement $-1$ is true, Statement $-2$ is true; Statement $-2$ is the correct explanation of Statement $-1$.
• C
  Statement $-1$ is true, Statement $-2$ is true; Statement $-2$ is not the correct explanation of Statement $-1$.
• D
  Statement $-1$ is false, Statement $-2$ is true.