Chladni's law

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Chladni's law, named after

modes of vibration
for flat circular surfaces with fixed center as a function of the numbers m of diametric (linear) nodes and n of radial (circular) nodes. It is stated as the equation

where C and p are

coefficients which depend on the properties of the plate.[1]

church bells in which case p can vary from 1.4 to 2.4.[2]
In fact, p can even vary for a single object, depending on which family of modes is being examined.

References

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