History
The first evidence of quantized energy levels in atoms was the observation of spectral lines in light from the sun in the early 1800s by Joseph von Fraunhofer and William Hyde Wollaston. The theoretical explanation for energy levels was discovered in 1913 by Danish physicist Neils Bohr in the Bohr theory of the atom. The modern quantum mechanical theory, based on the Schrodinger equation, was advanced by Erwin Schrodinger and Werner Heisenberg in 1926.
Read more about this topic: Energy Level
Famous quotes containing the word history:
“Boys forget what their country means by just reading “the land of the free” in history books. Then they get to be men, they forget even more. Liberty’s too precious a thing to be buried in books.”
—Sidney Buchman (1902–1975)
“All history is a record of the power of minorities, and of minorities of one.”
—Ralph Waldo Emerson (1803–1882)
“Certainly there is not the fight recorded in Concord history, at least, if in the history of America, that will bear a moment’s comparison with this, whether for the numbers engaged in it, or for the patriotism and heroism displayed.”
—Henry David Thoreau (1817–1862)