Solved Problems in Physics, Physical Chemistry, and Computer Simulation Projects for College and Graduate Students.

Energy and Entropy Density of Blackbody Radiation

Energy and Entropy Density of Blackbody Radiation

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The energy of radiation in thermal equilibrium within an enclosure ("blackbody" radiation) depends only on the volume and on the wall temperature T . It is also known that the pressure of the radiation is one-third the energy density. Show that the energy density u =V/U  and entropy density s = V/S of the radiation are given by:

             u = βT4,        s =4/3 βT3

where β is a constant.

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