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

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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)
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So, Until Sound Encounters some object, the “wavefront” is spherical We Can Also Talk About: Distance Traveled during each cycle = WAVELENGTH = c/f Wavelength = speed of sound / frequency Wavelength Questions: What is the wavelength in meters of a 1720 Hz sound traveling in air? What is the wavelength in meters of an 86 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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Fundamentals-ch2 - ACOUSTICS Sound in a Medium Sound Wave...

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