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At a recent rock concert, a dB meter registered 130 dB when placed 1.40 m in...

At a recent rock concert, a dB meter registered 130 dB when placed 1.40 m in front of a loudspeaker on the stage. (a) What was the power output of the speaker, assuming a hemispherical radiation of the sound and neglecting absorption in the air?  (b) How far away would the intensity level be a somewhat reasonable 85 dB?

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