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MCAT Question A Day - 3/30/14 - Answer!

The threshold of hearing has an intensity of 10-12 W/m2 (watts per square meter), which corresponds to a sound level B, of 0 db (decibels). What is the intensity of a 40db sound?

A.  40 x 10-12 W/m2
B.  10-3 W/m2
C.  10-8 W/m2
D.  40 x 10-3 W/m2

The correct answer is (C). Use the relation db = 10 log10(I/I0) where I0=10-12W/m2

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