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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Two identical loudspeakers 2.0 m apart are emitting 1800 Hz sound waves into a room where the speed of sound is 340 m/s. Is the point 4.0 m directlyin front of one of the speakers, perpendicular to the line joining the speakers, a point of maximum constructive interference, perfect destructive interference, or something in between?
Two small speakers, 0.610 m apart, are facing in the same direction. They are driven by one 685 Hz oscillator and therefore emit identical sound waves in phase with one another at the respective points of origin. (The speed of sound waves in air is 343 m/s.)
Two speakers are side by side, with one speaker on the left and one on the right. The speakers are separated by a distance d and emit sound waves in the same direction. A man stands directly in front of the speaker on the right but a distance x away from the right speaker.
(a)
A listener wishes to stand in front of one of the speakers, at the closest point (i.e., smallest x-value) where intensity is at a relative maximum. At what distance x from the nearest speaker should he position himself? (Enter your answer in m.)
m
(b)
The listener now wishes to stand at the closest point along that line where intensity is at a relative minimum. At what distance x should he position himself now? (Enter your answer in m.)
m
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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- You are overhearing a very heated conversation that registers 80 dB. You walk some distance away so that the intensity decreases by a factor of100. What is the sound intensity level now?A. 70 dB B. 60 dB C. 50 dB D. 40 dB E. 30 darrow_forwardA point source broadcasts sound into a uniform medium. If the intensity at a distance r is I, by what factor will the intensity change when the distance changes to 1.8r?arrow_forwardTwo sound waves have intensities of 1 times 10 to the -5 W/m2 and 5 times 10 to the -4 W/m2. What is the difference in their intensities levels (db)? I0 = 10 to the -12 W/m2.arrow_forward
- Susan stands directly in front of two speakers that are in line with each other. The farther speaker is 6.0 m from her; the closer speaker is 5.0 m away. The speakers are connected to the same 680 Hz sound source, and Susan hears the sound loud and clear. The frequency of the source is slowly increased until, at some point, Susan can no longer hear it. What is the frequency when when the frequency is increased (and the wavelength decreased) until Δd = (m + 1/2) λfinal; this will determine the final wavelength lfinal and hence the final frequency.arrow_forwardThe frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.)arrow_forwardA person standing 1.10 m from a portable speaker hears its sound at an intensity of 7.90 ✕ 10−3 W/m2. HINT (a) Find the corresponding decibel level. 98.98dB (b) Find the sound intensity (in W/m2) at a distance of 24.0 m, assuming the sound propagates as a spherical wave. W/m2 (c) Find the decibel level at a distance of 24.0 m. dBarrow_forward
- Two sound waves arrive to an observer, the first is loud at 2 W/m ^2 and the second one is quieter at 100 mW/m^2 ; how many dB louder is the first one compared to the second one?arrow_forwardTwo identical loudspeakers 2.0 m apart are emitting sound waves into a room where the speed of sound is 340 m/s. Abby is standing 5.0 m in front of one of the speakers, perpendicular to the line joining the speakers, and hears a maximum in the intensity of the sound. What is the lowest possible frequency of sound for which this is possible?arrow_forwarddetermine the reflected, R, and transmitted, T ratios for a 10-MHz ultrasound propagating from medium 1 to medium 2, through the following materials:(a) Lungs to muscle(b) Fat to blood(c) Kidney to muscle(d) Muscle to skull bone Material Impedance (kgm-2s-1) Lung 0.18x106 Fat 1.34x106 Kidney 1.63x106 Blood 1.65x106 Muscle 1.71x106 Skull Bone 7.8x106arrow_forward
- 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.arrow_forwardTwo identical loudspeakers are driven in phase by a common oscillator at 800 Hz and face each other at a distance of 1.25m.Locate the points along the line joining the two speakers where relative minima of sound pressure amplitude would be expected.arrow_forwardSpeakers A and B are emitting sound wave in phase with the same wavelength 175 Hz. Speaker A is a distance 2.00 m to the left of speaker B and point P is 3.50 m to the right of B, so 5.50 m to the right of speaker A. The speed of sound in the air is 350 m/s. Is the interference at point P constructive or destructive?arrow_forward
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