May 2011
Beginner
492 pages
14h 16m
English
Content preview from Heat and Thermodynamics
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12.7 Thermodynamics of Radiation
We have proved that radiation inside an enclosure at a uniform temperature can be regarded as a perfect gas. Accordingly, radiation should obey the laws of perfect gas.
Let V be the total volume of the enclosure and u the energy density inside the enclosure. Then, total energy in the enclosure is
U = V u
But,
u = aT4
∴ U = VaT4 (12.29)
This gives
Again,
This gives
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