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# 6)Two adjacent natural frequencies of an organ pipe are determined to be 912 Hz and 1008...

6)Two adjacent natural frequencies of an organ pipe are determined to be 912 Hz and 1008 Hz. (Assume the speed of sound is 343 m/s.)

(a) Calculate the fundamental frequency of this pipe.

(b) Calculate the length of this pipe.

7)A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 60 dB by an observer 10 km away.

(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 54 m from the train? Treat the horn as a point source and neglect any absorption of sound by the air. #### Earn Coins

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