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Re: Acoustics of fog
12/31/2000 11:58 AM
Michael Pankonien (948) wrote:
Sound travels through an elastic medium as a longitudnidal wave and is affected by density. Hence the old, "no sound or noise in a vacum", statements that we have all heard in science class. I don't have my acoustic engineering text available right now, but as far as the speed or the velocity of sound (or noise) is concerned, water vapor (fog) mixed homogeneously with air will present a more dense, mass per unit volume, path for sound pressure and it will travel faster. Dampening or attenuniation is frequency dependent, high frequencies are more directional or line of sight and can be damped easier, whereas low frequencies just keep on rolling and are harder, hence the "booming" sound of your neighbors stereo system or their 100 watt Marshall stack (grin).
Cutting the geek talk and giving a simple answer, yes, fog will dampen sound, the higher frequencies will not travel as far as they would given lower relative humidity.