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homework 36

# homework 36 - homework 36 NOORANI ZOHEB Latest unpenalized...

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homework 36 – NOORANI, ZOHEB 1 Latest unpenalized work: Apr 25 2008 Friday 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 26 2008, 4:00 am. Question 1, chap 17, sect 2. part 1 of 1 10 points An explosive charge is detonated at a height of several kilometers in the atmosphere. At a distance of 568 m from the explosion the acoustic pressure reaches a maximum of 4 . 11 N / m 2 . The density of the air is 1 . 55 kg / m 3 and the speed of sound is 343 m / s and sound waves in air are absorbed at a rate of approximately 5 . 66 dB / km. What will be the sound level at a distance 3 . 01 km from the explosion? Consider the atmosphere to be homogeneous over the dis- tances considered. Answer in units of dB. Question 2, chap 17, sect 2. part 1 of 1 0 points A rock band plays at an 80 dB sound level. How many times greater is the sound pressure from another rock band playing at 111 dB? Question 3, chap 17, sect 2. part 1 of 3 10 points A point source emits sound waves uniformly in all directions with a power output P . r rock concert A What is the intensity of the sound waves detected by a receiver a distance r from the source? Assume the receiver has a cross sec- tion A

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homework 36 - homework 36 NOORANI ZOHEB Latest unpenalized...

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