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An electric spark jumps along a straight line of length L 10 m emitting a...

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An electric spark jumps along a straight line of length L 10 m emitting a pulse of sound that travels radially outward from the spark The spark is said to be a line source of sound The power of this acoustic emission is P 1 6 x 104 W a What is the intensity I of the sound when it reaches a distance r 12 m from the spark b At what time rate PA is sound energy intercepted by an acoustic detector of area Ad 2 0cm aimed at the spark and located a distance r 12 m from the spark

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