Franck Hertz Apparatus Argon Gas Set Up

The Franck-Hertz Experiment Apparatus is designed to demonstrate the existence of quantized atomic energy levels through electron-atom collisions. The experiment provides fundamental evidence for quantum theory by observing the energy transfer between accelerated electrons and argon atoms inside a gas-filled vacuum tube. As electrons gain sufficient energy, they transfer discrete amounts of energy to argon atoms, producing characteristic variations in the anode current. Manufactured by Atico Export India.

Principle

The experiment is based on the inelastic collision of electrons with argon atoms inside a vacuum tube. Electrons emitted from a heated cathode are accelerated toward the anode through a controlled electric field. When the electrons acquire sufficient energy, they transfer a fixed quantum of energy to argon atoms during collisions, causing a sudden decrease in the anode current. As the accelerating voltage increases further, this process repeats, producing multiple current maxima and minima that demonstrate the existence of discrete atomic energy levels.

Objectives

• Demonstrate the existence of quantized atomic energy levels.
• Study the inelastic collision between electrons and argon atoms.
• Observe the characteristic current maxima and minima of the Franck-Hertz experiment.
• Verify the transfer of discrete energy quanta during electron-atom collisions.
• Understand the experimental evidence supporting quantum theory.

• Quantum physics experiments.
• Study of atomic energy levels.
• Electron collision experiments.
• Advanced physics laboratory demonstrations.

Additional Requirement

Dual-Channel Oscilloscope :

• User supplied.
• Required for automatic scan operation.

Argon-Filled Vacuum Tube :

• Produces 5 to 7 distinct current maxima for clear observation.

Wide Anode Current Range :

• Measurement range: 0.1 nA to 1 μA.

Automatic and Manual Operation :

• Supports automatic scan using an oscilloscope or chart recorder.
• Manual scan mode available for detailed experimentation.

Adjustable Voltage Controls :

• Stabilized filament voltage.
• Adjustable grid voltage.
• Adjustable anode voltage.

Digital Display :

• Built-in 3½-digit voltage and current readouts for accurate measurem