Franck-Hertz experiment


Franck-Hertz experiment

      in physics, first experimental verification of the existence of discrete energy states in atoms, performed (1914) by the German-born physicists James Franck (Franck, James) and Gustav Hertz (Hertz, Gustav).

      Franck and Hertz directed low-energy electrons through a gas enclosed in an electron tube. As the energy of the electrons was slowly increased, a certain critical electron energy was reached at which the electron stream made a change from almost undisturbed passage through the gas to nearly complete stoppage. The gas atoms were able to absorb the energy of the electrons only when it reached a certain critical value, indicating that within the gas atoms themselves the atomic electrons make an abrupt transition to a discrete higher energy level. As long as the bombarding electrons have less than this discrete amount of energy, no transition is possible and no energy is absorbed from the stream of electrons. When they have this precise energy, they lose it all at once in collisions to atomic electrons, which store the energy by being promoted to a higher energy level.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Franck-Hertz experiment — The Franck Hertz experiment was a physics experiment that provided support for the Bohr model of the atom, a precursor to quantum mechanics. In 1914, the German physicists James Franck and Gustav Ludwig Hertz sought to experimentally probe the… …   Wikipedia

  • Franck-Hertz-Versuch — Der Franck Hertz Versuch wurde erstmals in den Jahren 1911 bis 1914 von James Franck und Gustav Ludwig Hertz durchgeführt und belegt die Existenz von diskreten Energieniveaus in Atomen. Dieser Befund stützte das bohrsche Atommodell und trug zur… …   Deutsch Wikipedia

  • Franck-Hertz’s experiment — Franko ir Herco eksperimentas statusas T sritis Standartizacija ir metrologija apibrėžtis Elektronų susidūrimo su dujų ar metalo garų atomais ir molekulėmis tyrimas. atitikmenys: angl. Franck Hertz’s experiment vok. Franck Hertzscher… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Franck-Hertz’s experiment — Franko ir Herco eksperimentas statusas T sritis fizika atitikmenys: angl. Franck Hertz’s experiment vok. Franck Hertzscher Versuch, m rus. опыт Франка и Герца, m pranc. expérience de Franck et Hertz, f …   Fizikos terminų žodynas

  • Hertz (disambiguation) — Hertz may refer to:* Hertz, the SI unit of frequency (cycles per second) ** 2600 hertz, the frequency that AT T formerly put as a steady signal on any long distance telephone line that was not currently in use * Hertz (crater), a lunar crater… …   Wikipedia

  • Hertz, Gustav — ▪ German physicist in full  Gustav Ludwig Hertz  born July 22, 1887, Hamburg, Ger. died Oct. 30, 1975, Berlin, E.Ger.  German physicist who, with James Franck (Franck, James), received the Nobel Prize for Physics in 1925 for the Franck Hertz… …   Universalium

  • Franck, James — ▪ German physicist born Aug. 26, 1882, Hamburg, Ger. died May 21, 1964, Göttingen, W.Ger.  German born American physicist who shared the Nobel Prize for Physics in 1925 with Gustav Hertz (Hertz, Gustav) for research on the excitation and… …   Universalium

  • Franck — Frạnck,   1) [frãk], César Auguste Jean Guillaume Hubert, französischer Komponist deutsch belgischer Herkunft, * Lüttich 10. 12. 1822, ✝ Paris 8. 11. 1890; wurde nach Studien in Paris (A. Reicha) 1846 Organist ebenda an Notre Dame de Lorette,… …   Universal-Lexikon

  • Franck-Hertzscher Elektronenstoßversuch — Franko ir Herco eksperimentas statusas T sritis Standartizacija ir metrologija apibrėžtis Elektronų susidūrimo su dujų ar metalo garų atomais ir molekulėmis tyrimas. atitikmenys: angl. Franck Hertz’s experiment vok. Franck Hertzscher… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Franck-Hertzscher Versuch — Franko ir Herco eksperimentas statusas T sritis Standartizacija ir metrologija apibrėžtis Elektronų susidūrimo su dujų ar metalo garų atomais ir molekulėmis tyrimas. atitikmenys: angl. Franck Hertz’s experiment vok. Franck Hertzscher… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas


We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.