A certain crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. What is the intensity level due to a set of five such crying babies, all crying with the same intensity?
You can neglect any absorption, reflection, or interference of the sound. 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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