The effect on rice caused by resonance

 

This is an example of Chladni plate resonance. The rice itself isn’t vibrating, it is the plate underneath the rice that is vibrating. There are nodes that do no vibrate at each frequency, and this is where the rice accumulates. each frequency has different nodes, that is why the pattern changes. Many luthiers use this type of testing when building their instruments. It can be a good predictor of how an instrument soundboard will sound when compared to known good plate patterns.

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