Maximum photocurrent in photoelectric effect

[J-F]

I would like to know why, experimentaly, there is a difference between the maximum photocurrent with a yellow illumination (lambda = 580 nm) and other colors with a lower wavelenght like green or blue, respectively 546 and 404 nm. According to the theory, the max photocurrent does not depend of the wavelenght of the illumination

Thanks

[arcnets]

Originally posted by J-F
According to the theory, the max photocurrent does not depend of the wavelenght of the illuminationDon't know what theory you refer to, but it's certainly not quantum theory. Because quantum theory states that longer-wavelength radiation consists of photons with lower energy. Which thus have a smaller chance to kick an electron out of the photoconductor's surface. See here:
http://www.colorado.edu/physics/2000/quantumzone/photoelectric.html