1. Consider silicon and assume that in the first case the incident wavelength is = 1.0 um and in the second case, the incident wavelength is = 0.5 um. Calculate the thickness of a semiconductor that will absorb 90% of the incident photon energy. Give comment on your results by comparing the calculated answers. Absorption coefficient: a = 10 cm for = 1.0 um; = 10 cm for A 0.5 um. Light beam intensity is reduced to 1/10.