One of the mysteries of the English language finally explained.
Used attributive with reference to an approximation to Planck's radiation law that is valid only at long wavelengths and states that the flux of radiation from a black body at any particular wavelength is proportional to its temperature divided by the fourth power of the wavelength.
Early 20th century; earliest use found in Proceedings of the Royal Society of London. From the title of J. W. Strutt, 3rd Baron Rayleigh + the name of Sir James Hopwood Jeans, English physicist and astronomer.
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