Starting with this general form, derive the equation for the
Hints: For a), use the momentum distribution for photons deriveable from the Planck function B_{nu}(T). To save some time, that gives n(p)=2/h^{3} (e^{pc/kT}-1)^{-1}. For Fermions, you can use the Maxwell-Boltzman number density from Equation 8.1 in your text, suitably transformed to a momentum distribution in the nonrelativistic limit.