# Problem: You need to design a photodetector that can respond to the entire range of visible light.What is the maximum possible work function of the cathode?

###### FREE Expert Solution

Work function:

$\overline{){{\mathbf{E}}}_{{\mathbf{0}}}{\mathbf{=}}{\mathbf{h}}{{\mathbf{f}}}_{{\mathbf{0}}}{\mathbf{=}}\frac{\mathbf{h}\mathbf{c}}{{\mathbf{\lambda }}_{\mathbf{0}}}}$

The detector should be able to detect the least energy photons.

###### Problem Details

You need to design a photodetector that can respond to the entire range of visible light.

What is the maximum possible work function of the cathode?