Hi rude man (Nice nickname). Thanks for reply. The question is not about photodiodes. It is about photelectric experiment. The results of photoeectric experiment were explained by Einstein's photon model. The experiment completely follows photon energy model.
1. In photoelectric experiment, if anode potential w.r.t. cathode is increased, photocurrent first increases then becomes a constant, since all the photoelctorns ejected from cathode are collected at anode. If we increase the intensity of light at this point, the 'saturation current' increases...