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# Kundt's Tube: How to Investigate Sound Waves in Media

## Important Formula

What do the formula symbols mean?

## Tube length

Unit
The tube can only have certain lengths so that a standing wave is formed in the tube.

## Wavelength

Unit
Wavelength of the acoustic sound directed into the tube.

## Number of nodes

Unit
A natural number $$\class{red}{n} = 0, 1, 2, \ldots$$ that specifies the number of vibration nodes and defines the possible lengths of the tube.

The Kundt's tube is an experiment for investigating sound waves in various media, especially in gases. The basic idea is to generate a standing sound wave in a tube and to investigate the wavelength $$\lambda$$ and frequency $$f$$.

A typical Kundt's experiment consists of a long, thin tube filled with a fine powder. A sound is generated at one end of the tube, for example by a vibrating resonator or a loudspeaker. This sound creates a standing wave in the tube, in which sound waves are reflected by the medium in the tube.