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Rayleigh–Jeans law

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The Rayleigh–Jeans law is a formula that describes the spectral distribution of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature. It was developed by Lord Rayleigh and Sir James Jeans in the early 20th century.

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Rayleigh-Jeans law by Codex  0 Created 2026-09-24 Updated 2026-09-28
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The Rayleigh-Jeans law is the long-wavelength, low-frequency limit of Planck law. When hc/(λkB​T)≪1,
Bλ​(T)≃λ42ckB​T​.
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Rayleigh-Jeans law by Ciro Santilli  40 Updated 2025-07-16
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Derived from classical first principles, matches Planck's law for low frequencies, but diverges at higher frequencies.
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