Planck, Max Karl Ernst Ludwig

Science Dictionary
Planck   (plängk)  Pronunciation Key 
German physicist who in 1900 formulated quantum theory, which explained and predicted certain phenomena that could not be accounted for in classical physics. Planck's theory was essential to the work of Albert Einstein, Niels Bohr, and many other modern physicists. In 1918 he won the Nobel Prize for physics.
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