United Scientific Supplies Franck-Hertz Apparatus II
The Franck-Hertz experiment yields basic evidence for the existence of quantum states.
Supplier: United Scientific Supplies FHA002
- The Franck-Hertz Apparatus II is an improved model of the well-known Franck-Hertz Apparatus (FHA001), featuring stable, updated electronics and robust digital readouts for voltage and current.
- New fully shielded coax cables reduce electrical noise.
- The Franck-Hertz Experiment yields basic evidence for the existence of quantum states.
- Inside a vacuum tube filled with a trace of Ar gas, a beam of electrons is generated and accelerated towards a counter electrode.
- A voltage barrier ahead of the counter electrode only allows electrons with a certain minimum energy to get through and make a detectable current.
- As the accelerating energy is increased, changes in the current are observed.
- On the way to the counter electrode, electrons collide with Ar atoms.
- As the electron energy rises, it gives one quantum of energy to the Ar for ionization.
- Now the electron can’t pass the voltage barrier and the current drops.
- Valleys in the current curve are evidence of the donations of a quantum of energy.
- Ar-filled Franck-Hertz tube achieves 5-7 current maxima.
- Anode current range 0.1 nA—1 μA.
- Automatic scan to oscilloscope or chart recorder, or manual scan.
- Adjustable, stabilized filament, grid, and anode voltages.
- 3-1/2 digit voltage and current readouts.
- Requires user-supplied dual-channel oscilloscope for automatic scan.
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|Franck-Hertz Apparatus II
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