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Describes the spectral radiance of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature.

Bλ(λ,T)=2hc2λ51ehcλkBT−1B_\lambda(\lambda, T) = \frac{2hc^2}{\lambda^5} \frac{1}{e^{\frac{hc}{\lambda k_B T}} - 1}