Write Einstein's photoelectric equation. State clearly any two salient features observe in photoelctric effect, which can be explained on the basis of the above equation.

Explanation

Einstein's photoelectric equation : `K_("max") = (1)/(2) mv_("max")^(2) = hv - phi_(0)`
where `phi_(0)` is work function .
(i) A part of the energy of the photon is used in liberating the electron from the metal surface which is equal to the work function `f_(0)` of the metal .
(ii) The rest of the energy of the photon is used get the maximum kinetic energy `K_("max")` to the emitted photo electron.