Subject: Superposition of waves Date: Mon, 15 Dec 1997 20:37:48 +0100 From: Peter Ryder <ryder@physik.uni-bremen.de> Organization: University of Bremen To: hwang@phy03.phy.ntnu.edu.tw Your Java applet for superimposing wave is very nice, but the "medium" has the interesting property that the group velocity and the phase velocity have opposite signs! Well, that makes an intersting problem for the students to discuss.