Not too many other items for this lesson besides my video, but here is a WEBSITE that has an excellent simulation to let you see and hear moving waves. This will help with the Doppler Effect (VL 19-06) and this one. Play with it, and you'll see!
Source: Fowler, M. (2009, October 14). The Doppler Effect. Retrieved May 05, 2016, from http://galileo.phys.virginia.edu/classes/109N/more_stuff/flashlets/doppler.htm
