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Franck-Hertz Experiment (V 4)


Keyword: atomic physics

Warning: There are concerns about using this demonstration in the classroom. See Instructions for details or contact a member of TSG.

Demonstration Description:
A tube filled with a mixture of mercury and neon allows to demonstrate at room temperature the quantum transitions which results when electrons of different speeds collide inelastically with mercury and neon atoms. By increasing the acceleration voltage, the transitions can be observed visually in form of a characteristic color change. It is also possible to plot a current versus voltage curve with a few maxima and minima. This is done by means of an X-Y recorder.


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