1. By Willie Hustead

2. What is sound? Sound is a sequence of waves of pressure that travel through media such as air or water that is able to compress easily.

3. Compression and rarefaction Compression is the region of a wave in which the density and pressure are at a maximum. Rarefaction is the region of a wave in which the density and pressure are at a minimum.

4. Pitch Pitch is a measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave. Frequency is defined as the number of cycles per unit of time.

5. The Doppler Effect! The Doppler Effect, named after Austrian phsyicist Christian Doppler, is the change in frequency of a wave for an observer moving relative to a wave. Such as when a fire engine drives by, the siren is higher before and when it reaches a person, and lower when it passes by. http://upload.wikimedia.org/wikipedia/commons/9/9 0/Dopplerfrequenz.gif

6. Resonance A phenomenon that occurs when the frequency of a force applied to a system matches the natural frequency of vibration of the system, resulting in a large amplitude of vibration. On November 7, 1940, high winds caused the Tacoma Narrows suspension bridge to start resonating and eventually collapse.

8. Sound wave lab http://www.youtube.com/watch?v=wBydVCF4DrY Here is a pretty cool lab where a person is able to actually see sound waves.