Gustav Kirchhoff's contributions beyond circuit laws

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Too bad he didn't have PF in 1845. He could have published it as an Insights article. :wink:
 
As an EE I never really connected BBR and Spectral analysis - then to be attributed to him was remarkable'

According to Helge Kragh, "Quantum theory owes its origin to the study of thermal radiation, in particular to the "black-body" radiation that Robert Kirchhoff had first defined in 1859–1860."