Unformatted text preview: 6‘ . d. \l 9. The sound intensity level 0.7 m from a jack hammer is 130 dB relative to the
threshold of hearing. a. What is the sound intensity (W/rnz) of the jack hammer operating at this distance?
b. How much acoustic power is produced by one jack hammer? c. What is the sound intensity level (dB) at 0.7 m from two jack hammers? d? How far do you have to go from the two jack hammers to reduce the sound intensity level to the threshold of pain (12QdB)? 7km ”””” Mar , ............. 10. On a very warm day (30°C) you are sitting at the shallow end of a swimming pool '4
teaching a young Child to swim. When someone jumps off the diving board in the
deep end, the child (with head under water) hears the splash 0.11 s before you. How
long is the pool? Assume the speed of sound in water is 1500 m/s for this pool. = téOOm 15 Va 3W t s: (3‘9 ”J Sow ...
View Full Document
- Fall '08