| Planck | German physicist whose explanation of blackbody radiation in the context of quantized energy emissions initiated quantum theory (1858-1947) |
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| Planck | the constant of proportionality relating the energy of a photon to its frequency |
| Planck | (physics) the basis of quantum theory |
| Planck | (physics) an equation that expresses the distribution of energy in the radiated spectrum of an ideal black body |