Daniel Kish has been blind since he was 13 months old, but has learned to "see" using a form of echolocation. He clicks his tongue and sends out flashes of sound that bounce off surfaces in the environment and return to him, helping him...

This lesson will describe how the doppler effect is created by moving sound waves. It is 4 of 4 in the series titled "Doppler Effect."

Change the hertz, frequency, and volume with this online tone generator.

David explains what beat frequency means, how to find it, and solves a sample problem involving beat frequency. [11:48]

Find out why you can make music by blowing into empty bottles. [9:57]

A short video explaining that music is a sound produced by oscillations of pressure through a solid, liquid, and gas with a frequency within range of hearing. [1:30]

This classic science song now has a fun video to go along with it! Learn all about Vibration on Learning Games For Kids. [1:51]