The IEC 'Franck Hertz' apparatus is a self contained lab consisting of an electron tube (called a Thyratron) that contains Xenon gas in the glass envelope and various electrodes to permit the excitation of the gas molecules.
Power supplies are required for the tube heater and the Anode / Cathode voltage. The system is complete with an inbuilt 9V battery and amplifier so the very small currents can be seen on ordinary bench meters if a sensitive mirror galvanometer is not available.
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Brand : IEC