Rayleigh–Jeansn.
/ˌreɪlɪˈdʒiːns/, U.S. /ˌreɪliˈdʒins/ Physics.
Used attributively 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.
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Dulong and Petit's law1863
Rayleigh–Jeans1918
1918 Proc. Royal Soc. 94 281 If the Rayleigh-Jeans laws of radiation be assumed to hold, the ultimate energy due to radiation alone is two-thirds of that derived from the kinetic theory of gases.
1930 A. E. Ruark & H. C. Urey Atoms, Molecules & Quanta iii. 59 Planck's law approaches the Rayleigh–Jeans law if h approaches zero.
1970 G. K. Woodgate Elem. Atomic Struct. iii. 36 The approximation corresponds, for thermal radiation, to..n̄ ≈ kT / hν ≫ 1, which..leads at once to the Rayleigh–Jeans approximation for the energy density per unit frequency range.
2003 J. Losee Theories Sci. Progress vi. 54 Planck's equation is in asymptotic agreement with the Wien equation at short wavelengths and the Rayleigh–Jeans equation at long wavelengths.
This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022).
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