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Loudspeakers power output.

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At a recent rock concert, a dB meter registered 128 dB when placed 1.60 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?
___________ W
(b) How far away would the intensity level be a somewhat reasonable 85 dB?
___________ m

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