School of Physics Lecture Demonstration Manual

Wb-2 Kundt's Tube

Published: Tuesday 14 March 2006 - Updated: Wednesday 30 March 2011


To demonstrate standing waves in a closed pipe using fine particles (cork dust) to display the characteristic modes.



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Kundt's Tube Pic

Kundt's Tube Diaagram


Kundt's Tube


This apparatus demonstrates standing waves in a horizontal glass tube. The interior is sprinkled with fine dry cork dust. The frequency is adjusted and the dust is thrown into a recurring pattern when the signal excites the column of air at one of the standing wave frequencies. Kundt's tube may either be placed on the overhead projector or viewed via the T.V. camera and monitor.

Safety notes

Electrical safety 


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