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Visual physics and mathematics/Vibrations
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
A body can have many modes of vibration.
Vibration modes of a circular drum:
File:Tambour 1.gif
File:Tambour 1 2.gif
File:Tambour 2.gif
File:Tambour 2 2.gif
File:Tambour 5 3.gif
A mode of vibration of a square plate:
File:Stationary wave in a square.gif