Abstract
Jeans' number gives the number of vibration modes of electromagnetic equilibrium radiation. By application ofJeans' original method, a formula for this quantity is derived, valid for an anisotropic and dispersive medium. This derivation is followed by a discussion of different points of view of equilibrium radiation as built up by elementary beams. Finally, for an absorbing uniaxial crystal in thermal equilibrium, a relationship is derived, giving the number of quantum transitions related to emission and absorption of light.
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