This is one of the formulas that gives the energy u (λ) for each wavelength λ in cavity radiation, derived from classical physics. It only matches experiments for long wavelengths. This formula ( T is the absolute temperature of the cavity wall) was proposed semi-ad hoc by Rayleigh in 1900, criticizing the formula that W. Wien had presented. However, the values of the constants a and b were determined in 1905 based on an analogy with the vibrations of air inside a box and the Maxwell-Boltzmann law of equipartition of energy, and J. Jeans corrected the error in the value of b . Source: Heibonsha World Encyclopedia, 2nd Edition Information |
空洞放射における各波長λごとのエネルギーu(λ)をあたえる公式の一つで,古典物理学から導かれるもの。長い波長に対してしか実験に一致しない。この公式(Tは空洞の壁の絶対温度)は,1900年にレーリーがW.ウィーンの提出していた公式を批判しつつ半ばアド・ホックに提案した。ただし,定数a,bの値は05年になって箱の中の空気の振動とのアナロジーとマクスウェル=ボルツマンのエネルギー等分配則とに基づいて決定,J.ジーンズは,そのbの値の誤りを正した。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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