Rayleigh-Jeans law (source code)

= Rayleigh-Jeans law
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The Rayleigh-Jeans law is the long-wavelength, low-frequency limit of <Planck law>. When $hc/(\lambda k_BT)\ll1$,
$$
B_\lambda(T)\simeq\frac{2ck_BT}{\lambda^4}.
$$