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Ch. 13

Ch. 13 . Sound. Sound Waves. Longitudinal Waves Compression – region of high density and pressure Rarefaction – region of lower density and pressure. Sound Waves. Audible sound – frequencies humans hear (20 Hz – 20,000 Hz) Infrasonic waves – frequencies below 20 Hz

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Ch. 13

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  1. Ch. 13 Sound

  2. Sound Waves • Longitudinal Waves • Compression – region of high density and pressure • Rarefaction – region of lower density and pressure

  3. Sound Waves • Audible sound – frequencies humans hear (20 Hz – 20,000 Hz) • Infrasonic waves – frequencies below 20 Hz • Ultrasonic waves – frequencies above 20,000 Hz

  4. Sound Waves • Pitch – the perceived highness or lowness of a sound • Frequency determines pitch

  5. Ultrasonic Waves • Can produce images due to their short wavelengths • Waves are partially reflected when they reach a boundary between materials with different densities • Many medical uses • Dolphin echolocation

  6. Sound Waves • The speed of sound depends on the medium • Sounds travel fastest through solids • Sounds travel slowest through gases • The speed of sound also depends on the temperature of the medium • Sounds travel faster as temperature increases

  7. Sound Waves • Sound waves travel in three dimensions • Assume their shape is spherical • Represented graphically by a series of circles

  8. Sound Waves • Each circle is a wave front (center of each compression)

  9. Sound Waves • Rays are perpendicular to wave fronts and show direction of wave motion

  10. Doppler Effect • Relative motion creates a change in frequency • The frequency shift is called the Doppler Effect

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