Question: A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 4 2 dB by an

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 58 m from the train? Treat the horn as a point source and neglect any absorption of sound by the air.

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