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SOUND

SOUND. A different kind of wave. I. Longitudinal waves. The wave’s motion and the disturbance are parallel to each other Must have a medium Sound All other behaviors apply. II. Speed of sound. Same equations as before Denser the medium, the faster the speed

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SOUND

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  1. SOUND A different kind of wave

  2. I. Longitudinal waves The wave’s motion and the disturbance are parallel to each other Must have a medium Sound All other behaviors apply

  3. II. Speed of sound • Same equations as before • Denser the medium, the faster the speed • Hotter the temperature the faster the speed • Speed of sound in air = 331 + .6(T) • T is temperature in Celsius

  4. III. Perceiving sound • Pitch • What we hear • Depends on frequency • Higher the f , the higher the pitch. • Loudness • Also called intensity or volume • Measured in dB (decibels) • Decibels grow exponentially

  5. decibels

  6. IV. Doppler Effect • As an object moves, the frequency given off by an object changes. • Towards – frequency gets higher • Away – frequency gets lower • Uses • RADAR • Weather • stars

  7. V. Properties of sound • Reflection • Echo • Amphitheater/parabolic microphones • MACH • How many times the speed of sound an object goes • Breaking the sound barrier

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