http://www.instructables.com/id/Sound,-Sound,-and-more-Sound/
"introSound, Sound, and more Sound
Range of human hearing, Interference (three ways), Relationship of frequency and size. Lots of different investigations with sound are possible. Here are a few that I do as labs or demonstrations with my high school physics classes."
"introSound, Sound, and more Sound
Range of human hearing, Interference (three ways), Relationship of frequency and size. Lots of different investigations with sound are possible. Here are a few that I do as labs or demonstrations with my high school physics classes."