| planck | (n) German physicist whose explanation of blackbody radiation in the context of quantized energy emissions initiated quantum theory (1858-1947), Syn. Max Karl Ernst Ludwig Planck, Max Planck |
| planck's constant | (n) the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second, Syn. h |
| planck's law | (n) (physics) the basis of quantum theory; the energy of electromagnetic waves is contained in indivisible quanta that have to be radiated or absorbed as a whole; the magnitude is proportional to frequency where the constant of proportionality is given by Planck's constant |
| planck's radiation law | (n) (physics) an equation that expresses the distribution of energy in the radiated spectrum of an ideal black body |
