Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 15, Problem 67P
To determine
To calculate:
The intensity of the noise in decibel due to the
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The warning tag on a lawn mower states that it produces noise at a level of 99.0 dB. What is this in W/m2?
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The noise level in an empty examination hall is 42 dB. When 50 physics students are writing an exam, the sounds of heavy breathing and pens traveling rapidly over paper cause the noise level to rise to 55 dB (not counting the occasional groans). Assuming that each student contributes an equal amount of noise power, find the noise level when half of the students have left the examination hall. Do not enter the unit.
Chapter 15 Solutions
Physics for Scientists and Engineers
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- A sound wave traveling in air has a pressure amplitude of 0.5 Pa. What is the intensity of the wave?arrow_forwardThe amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound intensity level goes up by 40.0 dB?arrow_forwardCheck Your Understanding Identify common sounds at the levels of 10 dB, 50 dB, and 100 dB.arrow_forward
- Some studies suggest that the upper frequency limit of hearing is determined by the diameter of the eardrum. The wavelength of the sound wave and the diameter of the eardrum are approximately equal at this upper limit. If the relationship holds exactly, what is the diameter of the eardrum of a person capable of hearing 20 000 Hz? (Assume a body temperature of 37.0C.)arrow_forwardThe noise level in an empty examination hall (ambient noise) is40 dB. When 100 students are writing an exam, the sounds ofheavy breathing and pens travelling rapidly over paper cause thenoise level to rise to 60 dB. Assuming that each studentcontributes an equal amount of noise power, find the noise levelto the nearest decibel when 50 students have left.arrow_forwardWith the installation of noise suppression materials, the noise level in an auditorium was reduced from 93 to 80 decibels. Find the percent decrease in the intensity level of the noise as a result of the installation of these materials.arrow_forward
- You work at a building site and the noise level has been measured at 95 dB. You need to wear earplugs rated to reduce the sound intensity by 32 dB. If your eardrum has a diameter of 8.4 mm, what is the power received by one eardrum after you put in an earplug.arrow_forwardL = 10 log Recall that To where I is the intensity of sound in watts per square metre (W/m²) and I = 10-¹2 W/m². Determine the intensity of a baby screaming if the noise level is 100 dB.arrow_forwardProblem #2: The warning tag on a lawn mower states that it produces noise at a level of 91.0 dB. What is this in watts per meter squared?arrow_forward
- The cabin noise level of the new Boeing 787 "Dreamliner" may be about 6 decibels lower than that of a 777. By what factor does the noise intensity decrease?arrow_forwardThe area of a typical eardrum is about 5.0 x 105 m2, (a) Calculate the sound power (the energy per second) incident on an eardrum at the threshold of hearing. (b) Calculate the sound power incident on an eardrum at the threshold of pain.arrow_forwardA certain noise produces 6.2x10^-4 w/m^2 of power. What is the decibel level of this noise? Given that lo=10^-12 w/m^2.arrow_forward
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