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A rock group is playing in a club. Sound emerging outdoors from an open door spreads uniformly in all directions. If the decibel level

A rock group is playing in a club. Sound emerging outdoors from an open door spreads uniformly in all directions. If the decibel level is 60 dB at a distance of 0.80 m from the door, at what distance is the music just barely audible to a person with a normal threshold of hearing? Disregard absorption. Answer in units of m.

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