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13. If a sound source has a power of 8W and you observe an intensity...

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13. If a sound source has a power of 8W and you observe an intensity of 0.08 W/m, how far are you from the source?A submarine releases a frequency of 15000Hz that bounces off an enemy vessel. If the returning wave has a frequency of 19000Hz, is the enemy ship moving toward or away from the submarine?

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