Problem #8: The noise from a grinder in a factory is 32000 times more powerful than the noisefrom a dishwasher. By how many decibels is the factory noise greater than the dishwasher noise?Problem #9: A loud sound is 90 dB. When the sound is reduced to 5% of its original intensity,what is the decibel level?Problem #10: At a rock concert, a dB meter registered 130 dB when placed 2.8m in front of aloudspeaker on the stage. What is the power output of the speaker, assuming uniform sphericalspreading of the sound and neglecting absorption in air?Problem #11: By how many decibels do you reduce the sound intensity level due to a source ofsound if you quadruple your distance from it? Assume that the waves expand spherically.

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Answered: Problem #8: The noise from a grinder in…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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The intensity level in decibels is defined as 10 log10(I/I0), where I0 is a reference intensity equal to the human threshold of hearing, 10–12 W/m2. What is the intensity of the threshold of pain, 120 decibels? answer is : 10° W/m2 I'm not sure how they got this answer
Chapter 16, Problem 069 Your answer is partially correct. Try again. ES. lem The bellow of a territorial bull hippopotamus is measured at 116 dB above the threshold of hearing. What is the sound intensity? Hint: The threshold of human hearing is Io = 1.00 x 10-12 W/m2. plem %3D blem Number Units W/m^2 ▼ oblem the tolerance is +/-5% oblem roblem SHOW HINT Problem LINK TO TEXT Problem Problem By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Problem Question Attempts: 1 of 6 used SUBMIT ANSWER SAVE FOR LATER Problem Earn Maximum Points available only if you 8:02 PM 4/29/2020 19 e here to search 21 ASL pause break prt sc sysrq f11 f12 insert f8 f9 f10 f4 f5 f6 f7 f2 f3 backspace & %24 80 4 96
The loudness of sound can be measured on a decibel scale. The sound level L (in decibels) of a sound is given by 0-12 W/m². The L=10 log where I is the intensity of the sound (in watts per square meter, W/m²) and I = 10 1 intensity, I, of a whisper is 10-10 W/m². Find the decibel value of this sound. The decibel value of this sound is. (Simplify your answer. Type an integer or a fraction.) GEREID
You hear a sound of (5.6x10^1) decibels. What is the intensity? Give your answer in microwatts/m2 to 2 sf. Assume the threshold of human hearing is 1.0x10-12 W/m². Use two significant figures for your answer. Note: 1 µW = 1×106 W Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: х10 Answer
With a sound level meter, you measure the sound pressure level to 95 dB. A sound source is a work machine that is on a hard surface, i.e. it can be thought of as sending sound to the surface of a hemisphere. The device is 20 m away from you. Calculate the power of the sound produced by the device in watts to one decimal place. Also Calculate the sound pressure level to the nearest decibel if your distance from the device doubles.
A concert loudspeaker suspended high off the ground emits 45 W of sound power. What is the sound intensity that reaches the an audience member 80 m away from the speaker? units: How many decibels does the audience member hear? units:
Sound waves travel at roughly 340 m/s at room temperature. The minimum hearing range of a human is 20Hz. a) What is the wavelength of this wave? b) Could this wavelength fit inside the dimensions of Room 411( room dimensions are roughly 11.5 m x 8.7 m)? Justify your answer with sound reasoning
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.
The noise a lawn mower produces is 80 dB. How much noise is from 12 identical lawn mowers?
1. The noise from a power mower was measured at 109 dB. The noise level at a rock concert was measured at 118 dB. Find the ratio of the intensity of the rock music to that of the power mower. (Round your answer to the nearest whole number.) 2. The decibel level of the sound of a subway train was measured at 98 dB. Find the intensity in watts per square meter (W/m2). (Give your answer in scientific notation, correct to one decimal place.) (blank) × 10(blank) W/m2
If 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?
Problem #3: What intensity level dB in does a sound of 3. 04 × 10–4 W/m2 correspond to?

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