COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 13, Problem 113QAP
To determine
The two lowest frequencies emitted by the speakers.
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A round speaker emits sound waves uniformly in all direction. At a distance of 40.0m from the speaker, the sound intensity is 35 dB. What is the sound intensity level in a distance of 10.0m.
Two compact sources of sound near each other produce in-phase sine waves at
each source. One source is positioned at a distance x, =12.00 m from a microphone
2.
and the other source is positioned at a distance of x, =13.40 m from the same
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is s = 0.0350µm. The plane waves come from essentially the same direction so there
will be interference.
a. If the frequency emitted by the two sources is f = 425.0Hz and the speed of
sound is v= 340.0m/ s, what is the phase difference, 8, in radians, due to the
path length differences to the microphone?
b. When both sources are on, interference changes the total amplitude to
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Two speakers (A and B) lie on the y-axis, 4.0m apart. They emit exactly the same 280 Hz tone in phase with each other. You start right at speaker A and walk in the x-direction. How far from speaker A do you first hear a minimum in sound intensity? Assume the speed of sound in this room is 340 m/s.
Chapter 13 Solutions
COLLEGE PHYSICS
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- Speakers A and B are vibrating in phase. They are directly facing each other, are 1.33 m apart, and are each playing a 715 Hz tone. The speed of sound is 345 m/s. On the line between the speakers there are points where minimum sound intensity occurs. What is the distance of the nearest point from speaker A?arrow_forwardThe sound intensity level 1.0 m from a person talking in a normal conversational voice is 60 dB. Suppose you are outside, 100 m from the person speaking. If it is a very quiet day with minimal background noise, are you able to hear him or her?arrow_forwardThe figure shows two loudspeakers (A) and (B), and a point (C) where a listener is positioned. The speakers vibrate in phase and are playing a 68.0 Hz tone. The speed of sound is 343 m/s. The listener at point (C) hears the third constructive interference at a distance 4.00 m as measured from speaker (A). What is the separation (d) between the two speakers?arrow_forward
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- The loudest sound produced by a living organism on Earth is made by the bowhead whale (Balaena mysticetus). These whales can produce a sound that, if heard in air at a distance of 2.60 mm , would have an intensity level of 157 dBdB . This is roughly the equivalent of 5000 trumpeting elephants. How far away can you be from a 157 dBdB sound and still just barely hear it?(Assume a point source, and ignore reflections and absorption.)arrow_forwardA coyote can locate a sound source with good accuracy by comparing the arrival times of a sound wave at its two ears. Suppose a coyote is facing a bird and listening to it whistle at 1000 HzHz . The bird is 3.0 mm away, directly in front of the coyote’s right ear. The coyote’s ears are 15 cmcm apart on a line perpendicular to the right ear-bird line.What is the difference in the arrival time of the sound at the left ear and the right ear? Hint: You are looking for the difference between two numbers that are nearly the same. What does this near equality imply about the necessary precision during intermediate stages of the calculation?What is the ratio of this time difference to the period of the sound wave?arrow_forwardTwo speakers, one directly behind the other, are each generating a 245-Hz sound wave. What is the smallest separation distance between the speakers that will produce destructive interference at a listener standing in front of them? The speed of sound is 343 m/s.arrow_forward
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