Franck-Hertz experiment with a Ne-Tube

Article no. P2510315 | Type: Experiments

10 Minutes

University

heavy

Teachers/Professors , Students

Benefits

Fascinating Nobel Prize experiment (Franck-Hertz 1925)
Suitable for demonstration and lab courses as well
Compact neon tube in sturdy casing - ready to use due to short heat-up time
Control unit compatible to Ne and Hg tube
Easy-to-use software for control, data acquisition and evaluation

Learning objectives

Energy quantum
Quantum leap
Electron collision
Excitation energy

Principle

Electrons are accelerated in a tube filled with neon vapour. The excitation energy of neon is determined from the distance between the equidistant minima of the electron current in a variable opposing electric field.

Tasks

To record the counter current strength I in a Franck-Hertz tube as a function of the anode voltage U.
To determine the excitation energy E from the positions of the current strength minima or maxima by difference formation.