Intensity of Sound: A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2.
A. 79 dB
B. 69 dB
C. 56 dB
D. 49 dB
E. 36 dB
Answer: C
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