The Inverse Square Law teaches us that for every doubling of the distance between a sound source and the recipient of the sound, a 6 dB drop would occur if there were no echo (as from a mountain top). The further away from the noise source you are, the lower your decibel level readings will become. Sound intensity will diminish over time and distance. The following table will help illustrate the order of magnitude associated with dB.ĩ dB-Drop 12.5% of your noise has survivedġ0 dB-Drop 10% of your noise has survivedģ0 dB-Drop. For each 3 dB you drop, your sound pressure levels will drop another 50% of the remaining sound pressure. By dropping 6 decibels, for instance, you first move 3 dB, and then another 3 dB. This simply means that for every 3 decibels you move up or down the scale from 0-194, you are adding or dropping 50% of your remaining sound pressure levels to your exposure. The decibel scale is logarithmic, not linear. The pain threshold for human ear starts at about 120 dB. Conversational voice levels average a 65 dB rating, while OSHA demands hearing protection for factory workers exposed over an 8 hour period to levels stronger than 85 dB. Daytime hours average 10 dB more sound pressure than night time hours. Your average day is filled with sound sources that typically range from 30-100 dB. A dB reading of “0” indicates the faintest sound the human ear can detect, while a dB reading of “180” would be the equivalent to standing on a rocket pad during launch. The units define how loud a noise source is, ranging on a comparative scale from 0-194. What is a decibel? A decibel (dB) is a unit of measurement that gages the intensity of sound.
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