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A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 42 dB by an observer 10 km away.

(a) What is the average power generated by the horn?
W
(b) What intensity level of the horn's sound is observed by someone waiting at an intersection 53 m from the train? (Treat the horn as a point source and neglect any absorption of sound by the air.)
2dB

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