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#OTD in 1914 the Franck-Hertz electron collisions experiment showing internal quantum levels of atoms was first presented and supported Niels Bohr's theory on the structure of the atom. Photos: James Franck, a vacuum tube used in the experiment, and Gustav Hertz. #NobelPrize pic.twitter.com/hymyyWYPFW

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The Nobel Prize@NobelPrize

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