If the frequency and intensity are doubled simultaneously the what will be the effect on saturation current and maximum kinetic energy?Please explain.

remember one thing :: max. K.E depends only on the frequency whereas saturation current depends only on intensity.

so,doubling the freq. will only double the K.E & not saturation current.on the other hand doubling the intensity will only double the saturation current & not the K.E.

in ur case since both frequency and intensity are doubled,saturation current and maximum kinetic energy will also be doubled(directly proportional).