What must be the power of the horns output to achive

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a ship's horn can be heard above typical background noise if at intensity level 20 dB.

a) what must be the power of the horn's output to achive this level at 5.0 km away?

b) how many identical ship horns would be needed to raise the level to 30 dB at 5.0 km?

Reference no: EM13305574

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