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Question: a group of students camping during the summer are caught...

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A group of students camping during the summer are caught in an afternoon thunderstorm. A student, by a stroke of good luck, brought along a sound level meter. A thunder clap registers an intensity level of 100 dB. The sound arrived 4 s after the lightning flash was seen. Assuming that the source of the thunder clap produces spherical waves, Calculate the (acoustic) power produced.

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