The Ejs Wave Packet model displays the motion of an approximate wave packet.  The simulation allows an arbitrarily wave packet to be created.  The amplitude, maximum and minimum wave numbers, the number of components, and the dispersion relation can all be changed via text boxes. The default dispersion relation, with the frequency equal to the wavenumber, results in a wavepacket that does not spread. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.  

Ejs Wave Packet model was created using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the ejs_ehu_waves_wavepacket.jar file will run the program if Java is installed.  Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models.  Additional Ejs models for wave motion are available.  They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Please note that this resource requires at least version 1.5 of Java (JRE).