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
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