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

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

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