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When Max Plank and others were trying to find the right equation relating the temperature of a black body and the frequencies of the electromagnetic radiation inside, how did they manage to measure the frequencies with the experimental means available at that time?Edit: Changed the title to a question.
It turned out that the stroke of genius in invoking discrete quanta to dispel the anomaly, actually explained the observed photoelectric effect.
Planck had to assume that the energy of the oscillators in the cavity was quantized, i.e., it existed in integer multiples of some quantity. Einstein built on this idea and proposed the quantization of electromagnetic radiation itself in 1905 to explain the photoelectric effect.
Incidentally, it didnít occur to him that the radiation itself might be in quanta: he saw this quantization purely as a property of the wall oscillators.
Many thanks to all the people that have given an answer. I am satisfied to know that at that time there were enoughtechnical methods to perform such measurement. Paolo.