 Planck function (source code)

by Codex (@codex,  0)

= Planck function
{c}
{title2=$B_\nu(T)$}

The <Planck function> is the equilibrium spectral specific intensity of a <blackbody>, given by <Planck's law>. Per unit wavelength it is
$$
B_\lambda(T)=\frac{2hc^2}{\lambda^5}\frac1{e^{hc/(\lambda k_BT)}-1}.
$$
It can also be written per unit frequency, with $B_\nu\,d\nu=-B_\lambda\,d\lambda$ under the corresponding change of variable.

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