#2 A.26 micron sample of Gallium Arsenide is illuminated with monochromatic

light with energy hv=2.5eV. The absorption coefficient a = 5X10*(cm²). The

power incident on the sample is 11mW.

A. Find total energy absorbed per second (J/s) (5 Points)

B. Find the rate of excess thermal energy given up by electrons due to lattice

scattering before recombination (J/s) (5 Points)

Band Gap for GaAs = 1.43eV

C. Find the number of photons per second given off from recombination

events (10 Points)