At a recent rock concert a db meter registered 130 db when, Ask an Expert

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At a recent rock concert, a dB meter registered 130 dB when placed 1.50 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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