Question: A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 46 dB by an observer

A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 46 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. dB

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