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Chapter 17: Waves-II

Fundamentals Of Physics
Pages: 479 - 513

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119 Questions for Chapter 17: Waves-II

  1. Question: Figure 17-30 shows a stretched string of lengthand pipes a,b, c, and dof lengthsL, 2L, L/2, andL/2, respectively. The string’s tension is adjusted until the speed of waves on the string equals the speed of sound waves in the air.Thefundamental mode of oscillationis then set up on the string. In which pipe will the sound produced by the string cause resonance, and what oscillation mode willthat sound set up?

    Found on Page 506
  2. Question: A friend rides, in turn, the rims of three fast merry-go-roundswhile holding a sound source that emits isotropically at a certain frequency. You stand far from each merry-go-round. The frequency you hear for each of your friend’s three rides varies as the merry-go-round rotates. The variations in frequency for the three rides aregiven by the three curves in Fig. 17-29. Rank the curves according to:

    Found on Page 505
  3. Pipe has only one open end; pipe B is four times as long and has two open ends. Of the lowest 10 harmonic numbersnB of pipe B , what are the (a) smallest, (b) second smallest, and (c) third smallest values at which a harmonic frequency of matches one of the harmonic frequencies of A ?

    Found on Page 513
  4. A pipe0.60m long and closed at one end is filled with an unknown gas .The third lowest harmonic frequency for the pipe is 750Hz. (a) What is the speed of sound in the unknown gas? (b) What is the fundamental frequency for this pipe when it is filled with the unknown gas?

    Found on Page 513
  5. A sound wave travels out uniformly in all directions from a point source. (a) Justify the following expression for the displacement of the transmitting medium at any distance r from the source S(r,t)=brsink(r−vt): where b is a constant. Consider the speed, direction of propagation,periodicity, and intensity of the wave. (b) What is the dimensionof the constant ?

    Found on Page 513
  6. A police car is chasing a speeding Porsche 911. Assume that the Porsche’s maximum speed is80.0ms and the police car’s is 54.0ms. At the moment both cars reach their maximum speed, what frequency will the Porsche driver hear if the frequency of the police car’s siren is 440Hz? Take the speed of sound in air to be .340ms

    Found on Page 513
  7. Suppose a spherical loudspeaker emits sound isotropically at10W into a room with completely absorbent walls, floor, and ceiling (an anechoic chamber). (a) What is the intensity of the sound at distanced=3.0m from the center of the source? (b) What is the ratio of the wave amplitude atd=4.0m to that atd=3.0m

    Found on Page 513
  8. In Fig. 17-35, S1 and S2 are two isotropic point sources of sound. They emit waves in phase at wavelength0.50m ; they are separated byD=1.60m . If we move a sound detector along a large circle centered at the midpoint between the sources, at how many points do waves arrive at the detector (a) exactly in phase

    Found on Page 513
  9. Question: Figure 17-50 shows a transmitter and receiver of waves contained in a single instrument. It is used to measure the speed uof a target object (idealized as a flat plate) that is moving directly toward the unit, by analyzing the waves reflected from the target. What is uif the emitted frequency is 18.0 kHzand the detected frequency (of the returning waves) is 22.2 kHz?

    Found on Page 513
  10. Question:Kundt’s method for measuring the speed of sound. In Fig. 17-51, a rodRis clamped at its center; a diskDat its end projects into a glass tube that has cork filings spread over its interior. A plungerPis provided at the other end of the tube, and the tube is filled with a gas. The rod is made to oscillate longitudinally at frequencyfto produce sound waves inside the gas, and the location of the plunger is adjusted until a standing sound wave pattern is set up inside the tube. Once the standing wave is set up, the motion of the gas molecules causes the cork filings to collect in a pattern of ridges at the displacement nodes f=4.46×103. and the separation between ridges is 9.20 cm, what is the speed of sound i

    Found on Page 513

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