Air Generate Training

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Posted by admin | Posted in Uncategorized | Posted on 29-05-2004

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Air Generate Training
What is the average power generated by the horn?

A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 51 dB by an observer 10 km away.

(a) What is the average power generated by the horn?
in Watts

(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.)
In dBs

A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 51 dB by an observer 10 km away.

(a) What is the average power generated by the horn.

51 + (20log(10000) + (10log(4pi)) = 142 dB (rounded)

142/10 = 14.2

10^14.2 x 10^(-12) = 158.49 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.)
In dBs.

142 - (20log(58) + (10log(4pi)) = 95.74 dB

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