Question #2275

15.0 meters from a sound source that radiates freely in all directions, the intensity is 0.000550 W/m2. What is the rate at which the source is emitting sound energy? answer in Watts.

Expert's answer

The area of the sphere around the source is 4*π*R2 = 4*π*152 = 900*π.

So the rate is 900*π*0.00055 = 1.5551 W

Answer: 1.5551 W.

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