Subject: Applets Date: Thu, 22 Apr 1999 18:20:15 +0100 From: "Anthony Vinters" <Tony@g0wfg.demon.co.uk> To: <hwang@phy03.phy.ntnu.edu.tw> Dear Fu Kwun Hwang Thank you for the Applets, they are excellent! I have used them for teaching my students about Simple Hamonic Motion and the Principle of Superposition. Have you done one which shows the motions of particles within a Transverse Wave and a Longitudinal wave? It would be interesting to look at the particle motion and compare them within these two wave systems. If it were possible to show the phase relationship between any of the particles even better! Showing that any particles that are 2Pi radians out of phase with each other are 1 wavelength apart is something that students can find difficult to understand without the help of a moving model. Once again thank you for all your work. With best wishes: Mr.A.E.Vinters. Rishworth School