C1.1.3.6 Franck-Hertz Experiment

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Franck-Hertz Experiment

In 1914, J. Franck and G. Hertz reported observing discontinuous energy emission when electrons passed through mercury vapor, and the resulting emission of the ultraviolet spectral line ( λ = 254 nm) of mercury. A few months later, Niels Bohr recognized that their experiment supported his model of the atom. The de-excitation of neon atoms can occur indirectly via intermediate states, with the emission of photons. In this process, the photons have a wavelength in the visible range between red and green. The emitted light can thus be observed with the naked eye. Between the grids G1 and G2 reddish luminous layers, clearly separated from one another, can be observed, and their number increases with increasing voltage. These are zones of high excitation density, in which the excited atoms emit spectral light.


Components of experiment:

1 555 870 Ne Franck-Hertz tube
1 555 871 Holder with socket and screen
1 555 872 Connecting cable for Ne Franck-Hertz tube
1 555 880 Franck-Hertz supply unit
1 524 013 Sensor-CASSY 2
1 524 220 CASSY Lab 2
2 501 46 Connecting leads, 19 A, 100 cm, red/blue, pair
1 additionally required: PC with Windows 7 or higher