Principle
Cork dust in a glass tube is set into tiniest motion by a sound
wave. If the frequency of the sound wave matches the natural
frequency of the volume in the glass tube, a standing wave will
form. The cork dust then assembles in visible patterns that show
the nodes of pressure and motion of the standing wave. From the
length of the volume and the number of the nodes the velocity of
sound in the tube can be calculated for each natural frequency.
Benefits
- Two experiments in one: determination of the sound velocity and determination of the wavelength of standing waves
- Easy frequency setting thanks to digital function generator
Tasks
Determine the velocity of sound in air using Kundt's tube at
different lengths of volume.
What you can learn about
- Longitudinal waves
- Sound velocity in gases
- Frequency
- Wavelength
- Stationary waves
- Natural frequency
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