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On 1900 December 14, before the German Physical Society, Planck first showed one could derive the black-body radiation spectrum by assuming that light was emitted in discrete "quanta" of energy, whose size was equal to a constant times the frequency of that radiation. At the time, and for many years afterwards, Planck considered this simply a mathematical curiosity. It was a long time before he accepted the idea that these quanta -- now called photons -- were physical entities.

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