Planck constant A constant equal to 6.6256 × 10-34 joule second (6.6256 × 10-27 erg second). It scales the energy of electromagnetic radiation of frequency f so that the radiation appears only in quanta nhf, where n is an integer. Planck's constant was first introduced in 1900, in Planck's theory of blackbody radiation, and subsequently appeared in Einstein's 1905 theory of photons. Related categories • ATOMIC AND NUCLEAR PHYSICS • PARTICLE PHYSICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |