Tuning fork – source of pure tones
Musical instruments are tuned with the help of the especially pure tones of a tuning fork. But why does a tuning fork produce such pure tones?
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To check that this assumption is correct, the following experiment can be carried out:
A piece of glass covered in soot is placed on an overhead projector. A tuning fork is struck and the point of one of the tines is put carefully on the piece of glass and pulled along it.
The students notice that the vibrations of the tuning fork go "up and down" regularly. From this it can be concluded that tones are created when objects vibrate regularly.
Relevant for teaching:
Vibrations and waves