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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

• ✓
  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.