The photoelectric effect is based on

Question

$\begin {array} {1 1} (a)\;law\: of\: conservation\: of\: linear \: momentum & \quad (b)\;law \: of \: conservation\: of\: energy \\ (c)\;law\: of\: conservation \: of \: angular \: momentum & \quad (d)\;law\: of\: conservation\: of\: mass \end {array}$