Photons are massless light particles and they do not interact with each other. Consider a gas of N photons in volume V at temperature T. The energy e of a photon is related to its momentum p by the equation e = cp, where c is the speed of light. Find the pressure P and the internal energy E of the photon gas in terms of N, V, T, and k.
' Hint: ? = −??????, where the partition function ? = 4?? ∫(from 0 to infinity) ?? ?^2 * e^-e/kt
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