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At a rock concert, a dB meter registered 130 dB when placed 2.4 m in front...

At a rock concert, a dB meter registered 130 dB when placed 2.4 m in front of a loudspeaker on the stage. (A) What was the power output of the speaker, assuming uniform spherical spreading of the sound and neglecting absorption in the air? ANSWER: 720 W. (B) How far away would the sound level be a somewhat reasonable 65 dB ? Part B is the only one I need help with.

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