At a recent rock concert a db meter registered 114 db when, Physics

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At a recent rock concert a db meter registered 114 db when

At a recent rock concert, a dB meter registered 114 dB when placed 1.00 m in front of a loudspeaker on the stage.
What was the power output of the speaker, assuming a hemispherical radiation of the sound and neglecting absorption in the air?
W
How far away would the intensity level be a somewhat reasonable 85 dB?

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Physics: At a recent rock concert a db meter registered 114 db when

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Physics: At a recent rock concert a db meter registered 114 db when

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