Drums
When you hit a drum the membrane forms standing waves
There are "special" modes of vibration, wherein all points oscillate with the *same frequency*
There are actually an infinite # of such modes (called eigenmodes), for a given surface!
I've plotted the first 2
pic.twitter.com/oH1drV9NTy
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Replying to @InertialObservr
Looks like there's Bessel functions here too!
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