Main Question or Discussion Point
does increasing the intensity of the light lower the threshold frequency at which photons knock off electrons?
Without the sufficient frequency (small enough wavelength) the photons will be just reflected and not absorbed. There are only two possibilities, one photon of sufficient frequency (hence sufficient energy opposing the work function) is absorbed to knock one electron off the metal, or the photon being knocked off (reflected from the metal).The work function is a function of temperature right? Of course i'm nitpicking a little bit but i'm interested :) Of course the material will have to absorb that wavelength.