Planck law

The Planck spectral radiance of a blackbody is

B_{λ} (T) = \frac{2 h c ^{2}}{λ ^{5}} \frac{1}{e ^{h c / (λ k_{B} T)} - 1} .

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Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 315 / 2 / b / ii / Solution

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