Consider black body radiation at absolute temperature T. Show that:

a. The number of photons per unit volume is n = 2.029 ? 107 T3 photons/m3;

b. The average energy per photon is 3.73 ? 10 ^-23 Tj.

Hint:

dn d hc/ P(AT), fox dx ex-1 = = 2.4041; dx = ex. 15