A Sound Wave Radiates from a Source in All Directions

A sound wave radiates from a source in all directions.If the power of the sound source is 200 watts,then the intensity of the sound wave 100 m from the source is

A) 2.2 milliWatts/m².
B) 2.0 milliWatts/m².
C) 1.8 milliWatts/m².
D) 1.6 milliWatts/m².
E) 1.2 milliWatts/m².

Correct Answer:

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