Question: Consider black body radiation at absolute temperature T. Show that: a. The number of photons per unit volume is n = 2.029 ? 107 T3

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 =

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

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