W.F. MEGGERS COLLECTION,AMERICAN INSTITUTE OF PHYSICS,COLOURED BY SCIENCE PHOTO LIBRARY W.F. MEGGERS COLLECTION,AMERICAN INSTITUTE OF PHYSICS,COLOURED BY SCIENCE PHOTO LIBRARY
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Max Planck (1858-1947), German physicist. Planck pioneered quantum mechanics, revolutionizing classical physics. His 1900 paper describing black body radiation proposed that radiation must be emitted or received in energy packets (quanta), rather than continuously. Quantum theory was fully accepted after its successful prediction of the photoelectric effect (Einstein, 1905) and of the electronic structure of atoms (Bohr, 1913). Planck received the 1918 Nobel Prize for Physics for his work.
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