KA6757 Ne Franck-Hertz Tube, Mounted

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The Franck-Hertz experiment, (1913, Nobel Prize 1926), with the well defined periodic and equidistant minima and maxima of the collector electrode current, is undoubtedly one of the most impressive experiments to demonstrate and verify the quantum theory. In these demonstrations, it is possible to observe energy transitions produced by collisions between electrons and atoms. At first these collisions take place elastically without significant transfer of energy. As the accelerating voltage is increased, non elastic collisions take place. This energy transfer reappears with progressively increasing accelerating voltage.

KA6757 Neon Franck-Hertz Experiment This tube is available mounted on a free standing base with jacks for the electrical connections, This version of the experiment does not require an oven. The excitation energies of neon can be determined by well defined separations of minima. Emission of red light takes place when an electron drops from a higher to a lower excited state of a neon atom. This luminosity appears in layers separated by dark zones. When the accelerating voltage is increased, the appearance of a luminous layer is accompanied by a drop of the collector current. The tube has a cathode, a control grid, an accelerator grid (anode), and collector electrode on a screen, suitable for lecture or Lab work.