Image »Standing Waves in a Kundt's Tube « download
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The Kundt's tube is based on the generation of standing sound waves with the wavelength \( \class{blue}{\lambda} \) inside the air-filled tube. One end of the tube is closed with a piston, while the other end remains open. An acoustic signal is introduced into the tube through this open end, and for certain lengths \( L \) of the tube, a standing wave is formed.
To make the standing wave visible, dry scattering sand can be filled into the tube. Sand heaps form at the points where the standing wave nodes are located.
