Try this Java applet to find out about superposition--what happens when waves overlap. You control the frequency, velocity, amplitude, and phase of the waves. The frequencies of the waves can be different, so you can see beats. There's a short description of the physics and instructions on how to run the simulation.
%0 Electronic Source %A Hwang, Fu-Kwun %D January 29, 2004 %T NTNU Java: Superposition Principle of Wave %V 2015 %N 26 November 2015 %8 January 29, 2004 %9 application/java %U http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=19.0
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