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A rock group is playing in a bar. Sound emerging from the door spreads uniformly in...

A rock group is playing in a bar. Sound emerging from the door spreads uniformly in all directions. The intensity level of the music is 126 dB at a distance of 2.47 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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Answer #1

Use the equation for sound level and the relation of intensity with distance where intensity is inversely proportional to square of distance to find the required solution as shown below

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