Found this really great Physics of Sound lecture by MIT Professor Walter Lewin
Titled: Musical Instruments, Sound Cavities, and Normal Modes
Here is the link:
http://academicearth.org/lectures/music ... rmal-modes
I'm looking forward to watching more. I also want to try building the device at the end that uses nodal points to create patterns in the sand.
Physics of Sound lecture
Originally posted at johnlsayers.com, topic 12683.