When1: 1913
When2: 1928
Who: Niels Bohr [Bohr, Niels]
What: physicist
Where: Denmark
Detail: He lived 1885 to 1962, studied electromagnetic radiation energies, and explained atomic spectra. Absorbed or emitted light has electron orbital-transition energies [1913]. Electron angular momentum is shell number times Planck constant divided by 2 * pi. Electron rotation frequencies have discrete values. He philosophized about waves and particle complementarity and invented Copenhagen quantum-mechanics interpretation [1928].
Physical Sciences>Physics>History>Atomic Physics
5-Physics-History-Atomic Physics
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Date Modified: 2022.0224