5. You live on a busy street, but as a music lover, you want to reduce the traffic noise.(a) If you install special sound-reflecting windows that reduce the sound intensity level (in dB) by 30dB, by what fraction have you lowered the sound intensity lin (W/m?)?(b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the soundintensity level?6. Small speakers A and B are driven in phase at 725 Hz by the same audio oscillator. Both speakersstart out 4.50 m from the listener, but speaker A is slowly moved away as in the figure.a) At what distance d will the sound from the speakers first produce destructive interference at thelistener's location?b) If A is moved even farther away than in part (a), at what distance d will the speakers next producedestructive interference at the listener's location?c) After A starts moving away from its original spot, at what distance d will the speakers first produceconstructive interference at the listener's location?4 50 m-B

(a) Given: The intensity level reduced is 30 dB.

5. You live on a busy street, but as a music lover, you want to reduce the traffic noise. (a) If you install special sound-reflecting windows that reduce the sound intensity level (in dB) by 30 dB, by what fraction have you lowered the sound intensity lin (W/m²)? (b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?

5. You live on a busy street, but as a music lover, you want to reduce the traffic noise. (a) If you install special sound-reflecting windows that reduce the sound intensity level (in dB) by 30 dB, by what fraction have you lowered the sound intensity lin (W/m²)? (b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter14: Sound

Section: Chapter Questions

Problem 18P: A trumpet creates a sound intensity level of 1.15 102 dB at a distance of 1.00 m. (a) What is the...

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As the people sing in church, the sound level everywhere inside is 101 dB. No sound is transmitted through the massive walls, hut all the windows and doors are open on a summer morning. Their total area is 22.0 m2. (a) How much sound energy is radiated through the windows and doors in 20.0 min? (b) Suppose the ground is a good reflector and sound radiates from the church uniformly in all horizontal and upward directions. Find the sound level 1.00 km away.
(a) What are the loudnesses in phons of sounds having frequencies of 200, 1000, 5000, and 10,000 Hz. if they are all at the same 60.0dB sound intensity level? (b) If may are all at 110 dB? (c) If they are all at 20.0 dB?
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As a certain sound wave travels through the air, it produces pressure variations (above anti below atmospheric pressure) given by P = 1.27 sin (x - 34t) in SI units. Find (a) the amplitude of the pressure variations. (b) the frequency, (c) the wavelength in air. and (d| the speed of the sound wave.
An air column in a glass tube is open at one end and closed at the other by a movable piston. The air in the tube is warmed above room temperature, and a 384-Hz tuning fork is held at the open end. Resonance is heard when the piston is at a distance d1 = 22.8 cm from the open end and again when it is at a distance d2= 68.3 cm from the open end. (a) What speed of sound is implied by these data? (b) How far from the open end will the piston be when the next resonance is heard?
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(a) What is the intensity of a sound that has a level 7.00 dB lower than a 4.00109W/m2 sound? (b) What is the intensity of a sound that is 3.00 dB higher than a 4.00109W/m2 sound?
A church bell in a steeple rings once. At 300 m in from of the church, the maximum sound intensity is 2 W/m2. At 950 in behind the church, the maximum intensity is 0.2 W/m2. What is the main reason for the difference in the intensity? (a) Most of the sound is absorbed by the air before it gels far away from the source, (b) Most of the sound is absorbed by the ground as it travels away from the source, (c) The bell broadcasts the sound mostly toward the front, (d) At a larger distance, the power is spread over a larger area.
(a) What is the intensity in watts per meter squared of a just barely audible ZUD—Hz sound? (b) What is the intensity in watts per meter squared of a barely audible 4000—Hz sound?
Suppose all six equal-length strings of an acoustic guitar are played without fingering, that is, without being pressed down at any frets. What quantities are the same for all six strings? Choose all correct answers. (a) the fundamental frequency (b) the fundamental wavelength of the siring wave (c) the fundamental wavelength of the sound emitted (d) the speed of the string wave (e) the speed of the sound emitted
A trumpet creates a sound intensity level of 1.15 102 dB at a distance of 1.00 m. (a) What is the sound intensity of a trumpet at this distance? (b) What is the sound intensity of five trumpets at this distance? (c) Find the sound intensity of five trumpets at the location of the first row of an audience, 8.00 m away, assuming, for simplicity, the sound energy propagates uniformly in all directions. (d) Calculate the decibel level of the five trumpets in the first row. (e) If the trumpets are being played in an outdoor auditorium, how far away, in theory, can their combined sound be heard? (f) In practice such a sound could not be heard once the listener was 2-3 km away. Why cant the sound be heard at the distance found in part (e)? Hint: In a very quiet room the ambient sound intensity level is about 30 dB.