Assume that you are illuminating your solar cell with monochromatic light, that the photon flux incident on the surface is given by Jphoton (units: photons per area per second), the reflectivity is R, and the absorption coefficient is a. Derive an expression for the free carrier generation rate G(x) as a function of position x, in terms of Jphoton, R, and a. Assume that each absorbed photon generates one free carrier pair. (Yes, this is very similar to what is in the lecture notes)