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physics girl phd
Nov15-11, 02:39 PM
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P: 936
Most I know of are additions of harmonics (aka. fourier synthesis): Decent ones with different functions are on PhET and on the more obscure NTNUJava Physics simulation sites.

One that allows you to change frequency and direction of to co-linear waves is on NTNUJava, but doesn't include the possibility of dispersion.

Edited to add: This one might also serve you well!