\(e V_{0}=K_{\max }=h v-\phi\)

where, \(\phi\) is the work function.

Hence, as \(v\) increases (note that frequency of \(X\) -rays is greater than that of \(U.V.\) rays), both \(V_{0}\) and \(K_{\max }\) increase. So statment \(-\,1\) is correct.