This article is intended to show that from the standpoint of non-equilibrium thermodynamics the radiation law may be approached without resort to the thermal equilibrium conditions, quantum-mechanical considerations and Planck’s constant. In this case the radiation appears to be a process of ambient medium modulation with the oscillation frequencies intrinsic in the radiator with subsequent transfer of this excitation through the medium. In this case the excited wave, but not the particle named as photon, becomes the real quantum of radiation. The intensity of this quantum is found and the possibility is shown to thus overcome a number of the existing difficulties in comprehending and explaining the optical phenomena observed.
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