Planck's radiation law

The spectral radiance of a black body per unit solid angle is given by:

$\displaystyle I(\lambda,T) = \frac{ 2 h c^2}{\lambda^5} \, \frac{1}{e^{hc/ \lambda kT} - 1}$ (1)

It can also be given as a function of frequency:

$\displaystyle I(\nu,T) = \frac{2 h \nu^3}{c^2} \, \frac{1}{e^{hc/ \lambda kT} - 1}$ (2)



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