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Intensity can be expressed as power divided by the area over which the wave spreads out....

Intensity can be expressed as power divided by the area over which the wave spreads out. If a wave is spreading out evenly in all directions, then we can use a sphere to represent the area over which the wave has spread out.
We want to calculate the intensity of a 59.4-W sound source at a distance of 9.00 m under the assumption that the wave is spreading out evenly in all directions.
What is the surface area of a sphere with a radius of 9.00 m?
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What is the intensity of the sound wave at a location 9.00 m away from a 59.4-W sound source which is spreading out evenly in all directions?

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