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Max Planck was a full professor at the University of Berlin when he noted that black body radiation could be easily explained if one assumed that light could only exist in discrete "chunks" equal in energy to a constant times the frequency of that light. At the time he published his work, and for many years afterwards, Planck felt it was only a mathematical curiosity; it was only later that he concluded that these quanta (later called photons) were a real, physical entity.

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11y ago
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13y ago

In 1900 he discovered E=hf. Energy is equal to Planck's constant times frequency.

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Q: Where did Planck discover quantum theory?
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