9. Two small stereo speakers are driven in step by the same variable- frequency oscillator. Their sound is picked up by a microphone arranged as shown in the figure. For what two lowest frequencies above 100 Hz does their sound at the speakers produce (a) constructive interference and (b) destructive interference? (Given sound speed = 345 m/s.) 2.00 m 4.50 m Microphone

9. Two small stereo speakers are driven in step by the same variable- frequency oscillator. Their sound is picked up by a microphone arranged as shown in the figure. For what two lowest frequencies above 100 Hz does their sound at the speakers produce (a) constructive interference and (b) destructive interference? (Given sound speed = 345 m/s.) 2.00 m 4.50 m Microphone

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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2. Speakers A and B are vibrating out of phase. They are directly facing each other, are 6.60 m apart, and are each playing a 140 Hz tone. The speed of sound is 338 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? 0.89 On fourth Attempt = 0.25 0.886 m 156 ac2156 ac2156 A L₁ c2156 ac2156 C8156) L₂ B Show my other submissions 156 ac2156 ac2156 acc 56 ac2156 ac215
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?
Q19
2. Make a matrix of the general properties of the waves showing the following parameters.
1. Two speakers are 4.5 meters apart, in phase, and produce a single sound wave with wavelength λ = 0.8m. Three points labelled A, B, and C are 4.0m, 8.0m, and 12.0m below the speaker on the left, as shown. Fill in the table with the required information, and indicate whether the point sees Constructive or Destructive interference. (Hint: remember the Pythagorean theorem!) 4.5m A B C AL= L2 14₁-121 www. L₁ L₂ AL 2 C/D SAT SHOZ! To yousupo 4m 4m 4m A B C Hint: Remember the Pythagorean Thorem: c² = a² + b² a b с
Question 8
a0cm- Im - 0.2m 100cm 11. Gaston has a vocal tract that is 20cm long. Nanal carity 1la. What is the wavelength of his first harmonic (j.e. the lowest pitch or frequency that he can make, which is also the longest possible wavelength)? Oral cavity V-340mls 4. =0.8ml %3D 3. 4 (0.2m)=0.8m Vocal folds %3D 11b. What is the frequency of this particular sound? v: Amfm 8=425 Hz = 340mls 0.8 -425 H2 11c. What is the wavelength of his 2nd harmonic? d2=? L- MAm 2270.4m A2=10.2m) = 0,4m %3D
4. Two side-by-side (virtually no separation) speakers are wired such that they emit a single-frequency sound out of phase with each other by radians, and radially-outward. The tone heard from the two speakers combined has a decibel level of 36 dB. a. If one of the speakers is suddenly disconnected, what is the decibel level heard? b. If both speakers are connected and the listener moves to a distance from the speakers that is 5 times greater than where the 36dB sound was heard, what is the new decibel level heard? Assume that the waves travel radially from the speakers.
20. A bat navigates through ultrasonic beeps with a frequency of f the speed of sound towards a flat, stationary, wall, with what frequency does the bat hear the signal reflected from the wall? 40 kHz. If the bat is moving with a speed 0.040 times (1) 43 kHz (2) 40 kHz (3) 37 kHz (4) 34 kHz (5) 46 kHz