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Rayleigh–Jeans Physics.|ˌreɪlɪˈdʒiːns|
The name Rayleigh and that of Sir James Jeans (1877–1946), English physicist and astronomer, used attrib. with reference to an approximation to Planck's law (see Planck) that is valid at long wavelengths, according to which the flux of radiant energy from a perfect radiator, at any particular wavelength, is proportional to its temperature divided by the fourth power of the wavelength.
1930Ruark & Urey Atoms, Molecules & Quanta iii. 57 We obtain the radiation density, ρλdλ = 8πkTλ-4dλ. This is called the Rayleigh–Jeans distribution law. Ibid. 59 Planck's law approaches the Rayleigh–Jeans law if h approaches zero. 1948Worthing & Halliday Heat xiii. 445 Rayleigh erroneously included a factor of 8 in his evaluation of c1. The error was pointed out by the English physicist James Jeans (1877– ). For that reason, the law is often referred to as the Rayleigh–Jeans law. Just the reverse of what occurred in connection with the Wein law, the Rayleigh law predicts correct values in the long-wave⁓length region but fails elsewhere. 1970G. K. Woodgate Elem. Atomic Struct. iii. 36 The approximation corresponds, for thermal radiation, to.. n ≈ kT/hν {dblgt} 1 , which in eq. (3.16) or (3.13) leads at once to the Rayleigh–Jeans approximation for the energy density per unit frequency range. |