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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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the sound in the united center during a Chicago Bulls basketball game in 1998 was seven times as intense as it is today. If the decibel rating today is 89dB, then what was the intensity rating in 1998?
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- Suppose the purr of a cat has a sound intensity that is 260 times greater than the threshold level. Find the decibel level value for the cat's purr. Round to the nearest decibel.arrow_forwardA sound source with a frequency of 1700 Hz moves at 50 m / s towards a wall reflector that moves away from the source at 55 m / s. If the speed of sound is 343 m / s determine the frequency that detects the source of the reflected wave.arrow_forwardIf a sound with a singular frequency of 580 has an measured intensity of 9.79 x 10-5 w when at a distance of 5.88 m from the source, what is the decibel level when at a distance of 11.9 m from the source?arrow_forward
- You are at BNA (Nashville Airport) watching commercial airliners take off. At a distance of 1,020.6 away from the plane, you record a sound intensity level of 73.4 decibels. If you move such that the new sound intensity level is 88.07 decibels, how far are you away from the plane (in meters)?arrow_forwardA listener finds that the sound level of a flute is 7 dB higher than the sound level of a cello. How does the intensity of the flute compare with the intensity of the cello? If Ic =arrow_forwardThe intensity of a sound is 400 W/m2 If the intesity level of sound decreased by 10 decibels, what is the new observed intensity?arrow_forward
- What is the difference in sound level intensity that a person hears at a rock concert if they are 46.4 m away compared to a person 468 m away from a 11.8 W sound source?arrow_forwardThe sound level measured in a room by a person watching a movie on a home theater system varies from 50 dB during a quiet part to 90 dB during a loud part. Approximately how many times louder is the latter sound?arrow_forwardThe sound level measured in a room by a person watching a movie on a home theater system varies from 45 dB during a quiet part to 65 dB during a loud part. Approximately how many times louder is the latter sound?arrow_forward
- What is the intensity heard a distance of 2.70 m away from a speaker that emits sound in each direction with a power of 35.5 W?arrow_forwardSuppose the purr of a cat has a sound intensity that is 230 times greater than the threshold level. Find the decibel value for this cats purr. Round to the nearest decibelarrow_forward
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