Planck, Max, 1858-1947, German physicist. From his hypothesis (1900) that atoms emit and absorb energy only in discrete bundles (quanta) instead of continuously, as assumed in classical physics, QUANTUM MECHANICS was developed. Planck received the 1918 Nobel Prize in physics for his work on BLACKBODY radiation. He was professor (1889-1928) at the Univ. of Berlin and president (1930-35) of the Kaiser Wilhelm Society for the Advancement of Science, Berlin. Planck's constant is named for him.
A new quantum theory enunciated by German physicist Max Karl Ernst Ludwig Planck, 42, will have enormous impact on scientific thinking. Bodies that radiate energy do not emit the energy constantly but rather in discrete parcels which he calls quantums, says Planck.
Planck's constant (plängks) noun Symbol h
The constant of proportionality relating the energy of a photon to the frequency of that photon. Its value is approximately 6.626 × 10-34 joule-second.
[After Max Karl Ernst Ludwig Planck.]
-- Max Planck