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Transcribed Image Text:4. A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of
50 dB by an observer 10 km away (Treat the horn as a point source and neglect any absorption of
sound by the air).
(a) What is the average power generated by the horn?
(b) What intensity level of the horn's sound is observed by someone waiting at an intersection 50
m from the train?
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