power supply unit for franck-hertz experiment
The Power Supply Unit for Franck-Hertz Experiment is a fundamental piece of equipment for conducting the famous experiment. Through this, Franck and Hertz demonstrated the existence of discrete energy states in atoms, helping confirm the quantum theory.
The power supply unit is used to operate the mercury filled Franck-Hertz tube, the neon filled Franck-Hertz tube or the critical potential tubes during this experiment.
The equipment provides all the voltages needed to power the tubes and includes a sensitive built-in DC amplifier for measuring collector current. The voltages can simultaneously be read off a display. The accelerating voltage can be set up manually on the apparatus or set to a saw-tooth wave form. Additional measuring inputs are also available for the anode current and accelerating voltage.
An experiment regularly carried out by students, the Power Supply for Franck-Hertz Experiment is a useful addition to any classroom lab.
Franck-hertz experiment
The quantisation of energy and the generation, recording and evaluation of spectra, along with the experimental verification thereof, is included in most of the curricula used around the world.
The well known experiment, first performed by James Franck and Gustav Hertz in 1914, is critically important in terms of demonstrating discrete energy states in atoms. It provides strong confirmation of the idea of quantised atomic energy levels.
Technical specification
- Filament voltage UF: 0 − 12V, continuously adjustable
- Control voltage UG: 0 − 12V, continuously adjustable
- Accelerating voltage UA: 0 − 80V
- Modes of operation: manually adjusted / saw-tooth
- Counter-voltage UE: 0 − ±12V, continuously adjustable, switchable polarity
- Output UY for collector current IE: IE = UA * 38 nA/V (0 − 12V)
- Output UX for accelerating voltage UA: UX = UA / 10
- Outputs: 4mm safety sockets
- Input: BNC socket
- Dimensions: approx. 160 x 132 x 210mm3
- Weight: approx. 3.4kg
