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- Franck–Hertz_experiment abstract "The Franck–Hertz experiment was the first electrical measurement to clearly show the quantum nature of atoms, and thus "transformed our understanding of the world". It was presented on April 24, 1914 to the German Physical Society in a paper by James Franck and Gustav Hertz. Franck and Hertz had designed a vacuum tube for studying energetic electrons that flew through a thin vapor of mercury atoms. They discovered that, when an electron collided with a mercury atom, it could lose only a specific quantity (4.9 electron volts) of its kinetic energy, which corresponds to decelerating the electron from a speed of about 1.3 million meters per second to zero.These experimental results proved to be consistent with the Bohr model for atoms that had been proposed the previous year by Niels Bohr. The Bohr model was a precursor of quantum mechanics and of the electron shell model of atoms. Its key feature was that an electron inside an atom occupies one of the atom's "quantum energy levels". Before a collision, an electron inside the mercury atom occupies its lowest available energy level. After the collision, the electron occupies a higher level with 4.9 electron volts (eV) more energy. There were no intermediate levels or possibilities in Bohr's quantum model. This feature was "revolutionary" because it was inconsistent with the expectation that an electron could be bound to an atom's nucleus by any amount of energy, just as a planet can be bound to a star by any energy.In a second paper presented in May 1914, Franck and Hertz reported on the light emission by the mercury atoms that had absorbed energy from collisions. They showed that the wavelength of this ultraviolet light corresponded exactly to the 4.9 eV of energy that the flying electron had lost; for visible light, different wavelengths correspond to different colors. The relationship of energy and wavelength had also been predicted by Bohr. After a presentation of these results by Franck a few years later, Albert Einstein is said to have remarked, "It's so lovely it makes you cry."On December 10, 1926, Franck and Hertz were awarded the 1925 Nobel Prize in Physics "for their discovery of the laws governing the impact of an electron upon an atom."".
- Franck–Hertz_experiment thumbnail FranckHertzHgTube.jpg?width=300.
- Franck–Hertz_experiment wikiPageID "381805".
- Franck–Hertz_experiment wikiPageRevisionID "606426452".
- Franck–Hertz_experiment subject Category:1914_in_science.
- Franck–Hertz_experiment subject Category:Foundational_quantum_physics.
- Franck–Hertz_experiment subject Category:Physics_experiments.
- Franck–Hertz_experiment comment "The Franck–Hertz experiment was the first electrical measurement to clearly show the quantum nature of atoms, and thus "transformed our understanding of the world". It was presented on April 24, 1914 to the German Physical Society in a paper by James Franck and Gustav Hertz. Franck and Hertz had designed a vacuum tube for studying energetic electrons that flew through a thin vapor of mercury atoms.".
- Franck–Hertz_experiment label "Eksperyment Francka-Hertza".
- Franck–Hertz_experiment label "Esperimento di Franck-Hertz".
- Franck–Hertz_experiment label "Experimento de Franck y Hertz".
- Franck–Hertz_experiment label "Experimento de Franck-Hertz".
- Franck–Hertz_experiment label "Expérience de Franck et Hertz".
- Franck–Hertz_experiment label "Franck-Hertz-Versuch".
- Franck–Hertz_experiment label "Franck–Hertz experiment".
- Franck–Hertz_experiment label "Опыт Франка — Герца".
- Franck–Hertz_experiment label "تجربة فرانك-هرتز".
- Franck–Hertz_experiment label "フランク＝ヘルツの実験".
- Franck–Hertz_experiment label "法蘭克-赫茲實驗".
- Franck–Hertz_experiment sameAs Franck%E2%80%93Hertz_experiment.
- Franck–Hertz_experiment sameAs Franck-Hertz-Versuch.
- Franck–Hertz_experiment sameAs Experimento_de_Franck_y_Hertz.
- Franck–Hertz_experiment sameAs Expérience_de_Franck_et_Hertz.
- Franck–Hertz_experiment sameAs Esperimento_di_Franck-Hertz.
- Franck–Hertz_experiment sameAs フランク＝ヘルツの実験.
- Franck–Hertz_experiment sameAs 프랑크-헤르츠_실험.
- Franck–Hertz_experiment sameAs Eksperyment_Francka-Hertza.
- Franck–Hertz_experiment sameAs Experimento_de_Franck-Hertz.
- Franck–Hertz_experiment sameAs Q726406.
- Franck–Hertz_experiment sameAs Q726406.
- Franck–Hertz_experiment wasDerivedFrom Franck–Hertz_experiment?oldid=606426452.
- Franck–Hertz_experiment depiction FranckHertzHgTube.jpg.
