The Threshold of a hearing is 10^-12 watts/m^2 or 0 dB.
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The Threshold of a hearing is 10^-12 watts/m^2 or 0 dB.

[From: ] [author: ] [Date: 11-12-13] [Hit: ]
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How many times more intense than the threshold of hearing is 70 dB and what is the actual intensity (in watts/m^2) at the 70 dB level?

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the decibel scale is calibrated so that a difference of 10 in the dB scale is equal to a factor of 10 in intensity, with the threshold of hearing set to 0 dB

therefore, the 70dB level is 7 differences of 10, and therefore the intensity is 10^7 times greater

the 70 dB sound is then 10^7 times greater than an intensity of 10^-12W/m^2 and is

10^-5 W/m^2
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