Page:Zur Thermodynamik bewegter Systeme (Fortsetzung).djvu/7

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However, according to (16) it is:

where is the radiation intensity in the resting cavity. Thus it must be


or, since :

This is in agreement with the generally valid theorems of the theory of H. A. Lorentz.[1]

If we set in accordance with the Stefan-Boltmann law

then it follows (see. (14)):

The constant of the Stefan-Boltzmann law is thus to be divided by .

The energy density of the true radiation is:

thus it has the same value as in the resting cavity.

The total energy follows from (17): it has the value:

  1. See for instance, M. Abraham, Theorie der Elektrizität, II, p. 282 (1905)