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Sound Waves

Sound Waves. By Willie Hustead. 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. . Compression and rarefaction. Compression is the region of a wave in which the density and pressure are at a maximum.

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Sound Waves

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  1. Sound Waves 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 phsyicistChristian 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/9/90/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.

  7. 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.

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