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Franck–Hertz experiment

Wikipedia Bot (@wikibot, 0) Physics Physics in society History of physics Foundational quantum physics
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The Franck-Hertz experiment, conducted by James Franck and Gustav Hertz in 1914, is a foundational experiment in quantum physics that demonstrated the quantized nature of energy levels in atoms. It provided strong evidence for the existence of discrete energy states in atoms, which was a pivotal development in the understanding of atomic structure and quantum mechanics. ### Experimental Setup: In the experiment, a tube containing low-pressure mercury vapor was used.

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Franck-Hertz experiment by Ciro Santilli 37 Updated 2025-07-16
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