Problem $2.$ Using the energy band diagram, visualize the following:

a$)$ An electron with kinetic energy $\backslash (=0\backslash )$

b$)$ Photogeneration

c$)$ Direct thermal generation

d$)$ Band$-$to$-$Band recombination

e$)$ Recombination via R$-$G centers.

f$)$ Generation via R$-$G centers