Some time ago I asked my quantum physics lecturer the question:
How did Planck derive his formula, the Planck–Einstein relation $$E=hf$$ with constant of proportionality $h$, the Planck constant.
I was motivated by the fact that every lecturer talks about the history of this formula (black body, birth of quantum mechanics etc) but I've never encountered an explanation of how Planck derived it.
My lecturer told me that he had researched it and found only old articles in German. Moreover he said that he couldn't find a derivation in professional physics books. This is something that every author assumes needs no derivation.
So how did Planck derive this formula?
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