# Energy density in cavity radiation as a function of frequency

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(a)

Energy per unit volume per unit frequency of a blackbody radiation is

S = 2Ï€(kT)^3/(c^2h^2) * x^3/(e^x-1), (1)

where x = hf/(kT)

As the energy of a photon is hf, the number of photons per unit volume per unit frequency is

N = S/(hf) = 2Ï€(kT)^2/(c^2h^2) * x^2/(e^x-1) (2)

1(b)

Its maximum is when dN/dx = 0. Differentiating equation (2) we obtain the condition ...

#### Solution Summary

This solution answers questions addressing frequency, wavelength and energy density.

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