S1 : When ultraviolet light is incident on a photocell, its stopping potential is $V_{\circ}$ and the maximum kinetic energy of the photoelectrons is $K_{max}$ increase. . When the ultraviolet light is replaced by x-rays, both $V_{\circ}$ and $K_{max}$ S2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

Question

$\begin{array}{1 1} \text{(a) S1 is true, S2 is true; S2 is correct explanation of S1.}\\ \text{(b) S1 is true, S2 is true; S2 is not correct explanation of S1.} \\ \text{(c)S1 is false; S2 is true.}\\ \text{(d) S1 is true; S2 is false.}\end{array}$