MCAT Question A Day - 9/13/13 - Answer!
What is the sound level of a wave with an intensity of 10-3 W/m2?
A. 30 dB
B. 60 dB
C. 90 dB
D. 120 dB
The correct answer is (C). b = 10 log I/I0 = 10 log (10-3/10-12) = 10 log 109 = 10 * 9 = 90 dB
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