2. While Dr. Benton was waiting at a stop light the other day, a car pulled up next to him emitting low frequency periodic thumping sounds out from the subwoofers of its stereo system at an intensity that he estimated to be 100 dB. If the car was 5 m away, how intense was the music for the people in the car sitting 1 m away from the speakers?

2. While Dr. Benton was waiting at a stop light the other day, a car pulled up next to him emitting low frequency periodic thumping sounds out from the subwoofers of its stereo system at an intensity that he estimated to be 100 dB. If the car was 5 m away, how intense was the music for the people in the car sitting 1 m away from the speakers?

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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9. Two speakers are facing each other and producing a single pure tone. You are standing between the two speakers. The loudness goes from a maximum, down to a minimum and back to a maximum as you move a distance of d = 3.5 m towards one of the speakers. What is the wavelength of the sound wave produced by the speakers?
In an acoustics lab you have a 120 m long pipe containing very cold air. Suppose that using a speaker you cause a sinusoidal wave of sound with frequency 150 Hz and wavelength 1.9 m to travel down the pipe. i)How long does it take for your sinusoidal wave to travel from one end of the pipe to the other end of the pipe? ii)What is the temperature of the air in the pipe?
A loudspeaker on a pole at the same height as your ears is radiating 100 W of sound energy in all directions. You are walking directly toward the speaker at 0.60 m/s. Assume your ears are 20 m away from the loudspeaker itself and, although it is not realistic, ignore all reflections of sound from nearby objects such as the ground. What is the sound intensity level at the location of your ears? Express your answer with dB units. ► View Available Hint(s) B Submit Part B dß dt = Submit μÀ || Value What is the rate (dB/s) at which the sound intensity level is increasing? Hint: Use the chain rule and the relationship log₁0 x = ln x/ ln 10. Express your answer in decibels per second. ► View Available Hint(s) Units VE ΑΣΦ www ? ? dB/s
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A) a guitar player sounds C above middle C (522 Hz) while traveling in a convertible at 35m/s. If the car is coming toward you, what frequency would you hear? Use 343 m/s as the speed of sound. B) repeat the problem above, but with the car moving away from you. What frequency would you hear?
Problem #3: What intensity level dB in does a sound of 3. 04 × 10–4 W/m2 correspond to?
2. Emma needs to know the fundamental frequency of a guitar string. She sounds the string together with an 840Hz tuning fork, and counts 15 beats in 5.0s. She then sounds the string with an 835Hz tuning fork and counts 2 beats every second. What is the frequency of the string?
1. The low-frequency speaker of a stereo set has a surface area of 0.05 m and produces 1 W of acoustical power. (a) What is the intensity at the speaker? (b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the W intensity 0.26 -? m2 Hint: If the sound projects uniformly in all directions, after traveling a distance r it is uniformly distributed over a sphere of area r. What is the surface area of a sphere of radius r? W (a) Intensity: m? (b) Distance (radius), r: m
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