User:Johnjbarton/sandbox/introduction to quantum mechanics: Difference between revisions
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=== Evidence of quanta from the photoelectric effect ===
{{main | Photoelectric Effect}}
The seeds of the quantum revolution appear in the discovery by [[JJ Thomson]] in 1897 that [[cathode rays]] were not continuous but "corpuscles" identical to [[electrons]]. Electrons had been named just six years as part of the emerging theory of [[atoms]]. In 1900, [[Max Planck]], a conservative physicist unconvinced by the [[atomic theory]], discovered that he needed discrete entities like atoms or electrons to explain [[blackbody radiation]].<ref name=Baggott>{{Cite book |last=Baggott |first=J. E. |title=The quantum story: a history in 40 moments |date=2013 |publisher=Oxford Univ. Press |isbn=978-0-19-965597-7 |edition=Impression: 3 |___location=Oxford}}</ref>
[[File:Black body.svg|thumb|upright=1.4|Blackbody radiation intensity vs color and temperature. The rainbow bar represents visible light; 5000K objects are "white hot" by mixing differing colors of visible light. To the right is the invisible infrared. Classical theory (black curve for 5000K) fails; the other curves are correct predicted by quantum theories.]]
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