fundies-ch2 - ACOUSTICS ◗ Sound in a Medium ◗ Sound...

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Unformatted text preview: ACOUSTICS ◗ Sound in a Medium ◗ Sound Wave Phenomena ◗ Sound Fields ◗ Earphones ◗ Resonance and Standing Waves Sound in a Medium ◗ Vibrating object displaces molecules in medium ◗ molecules move back and forth ◗ “bump” into others transmitting vibration thru medium In the Medium: ◗ We have both OSCILLATION of particles ◗ and ◗ TRANSMISSION of energy (or propagation) Particle Motion ◗ In Air, in line with transmission-- LONGITUDINAL ◗ On Water, perpendicular to transmission-- TRANSVERSE Displacement of Molecules in the Medium ◗ creates areas of more molecules ◗--increased density--CONDENSATION ◗ and areas of fewer molecules ◗--decreased density--RAREFACTION Because We have Transmission: ◗ We can talk about how fast sound travels in the medium = SPEED OF SOUND or c ◗ Depends on medium, temperature, density, state ◗ In Air = 344 meters/sec or 1100 feet/sec Sound Travels Out From the Source • In All Directions • (at the same speed) • So, Until Sound Encounters some object, • the “wavefront” is spherical We Can Also Talk About: ◗ Distance Traveled during each cycle ◗ = WAVELENGTH S = c/f • Wavelength = speed of sound / frequency Wavelength Questions: • What is the wavelength in meters of a 1720 Hz sound traveling in air?...
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This note was uploaded on 08/23/2011 for the course SPA 3032 taught by Professor Gerhardt during the Spring '08 term at University of Florida.

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fundies-ch2 - ACOUSTICS ◗ Sound in a Medium ◗ Sound...

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