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January 11

Planck's Law and Kirchhoff-Clausius law

In § 7 Chapter II of "On the Law of the Energy Distribution in the Normal Spectrum; by Max Planck."[1], one reads:

"According to Kirchhoff-Clausius law, the energy of a temperature ϑ and the number of vibrations ν, when emitted by a black surface per unit of time into a diathermic medium, is inversely proportional to the square c² of the propagation speed."

I did not find this law in this form anywhere . Can anyone help me understand this sentence? Malypaet (talk) 22:59, 11 January 2024 (UTC)[reply]

Finaly I found it in "eight lecture at colombia" from Gutemberg project p35:

G. Kirchhoff, Gesammelte Abhandlungen, Leipzig, J. A. Earth, 1882, p. 594.[2] Malypaet (talk) 22:12, 13 January 2024 (UTC)[reply]