How Far Must One Stand from a 5-MW Point Sound

question 13

Multiple Choice

How far must one stand from a 5-mW point sound source if the intensity at that location is at the hearing threshold? Assume the sound waves travel to the listener without being disturbed.

• A)500 m
• B)1 km
• C)2 km
• D)4 km
• E)20 km

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