Sound Level: a Certain Crying Baby Emits Sound with an Intensity

question 42

Multiple Choice

Sound level: 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