How do the oscillations of a high tone differ from those of a low tone? Using this disk, first invented by Charles Cagniard de la Tour, your students can investigate how frequency influences pitch by directly counting the oscillations from the disk. The uniformly-spaced holes allow you to experiment with 8, 10, 12, 16, 24, 27, 30, 32, 36, 40, 45, and 48 holes per revolution. The unit comes with a sounding tube and a mandrel, or you can choose to mount it on a standard lab rotor.
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