Wikipedia:Reference desk/Archives/Science/2024 January 11

= 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.", 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)


 * Finaly I found it in "eight lecture at colombia" from Gutemberg project p35:
 * G. Kirchhoff, Gesammelte Abhandlungen, Leipzig, J. A. Earth, 1882, p. 594. Malypaet (talk) 22:12, 13 January 2024 (UTC)