Chapter 14: Waves and Sound Selected Solutions

Selected Solutions

11. The tension F is related to the speed v by F = mv².

The speed can be determined by the length of the wire and the time t

(b) for a given v and L. So increased mass means increased tension.

(c) For a different value of m the tension is given by the same formula

23. (a) total time = fall time + sound travel time, so t_tot = t_f + t_s

(b) Less, because although the sound travel time would double, the fall time would less than double (increasing only by a factor of ).

43. (a) Since they are approaching each other

(b) Bicyclist A speeding up. For equal changes in speed, moving-source effects are greater than moving observer effects.

55. Since the observer moves from hearing destructive interference directly to hearing constructive interference, the difference in distances from the two speakers must equal one half-wavelength.

63. (a) The wave shown represents the 3^rd harmonic which corresponds to f₃ = 3f₁. Therefore,

(b)

Selected Solutions by David Reid, Eastern Michigan University. ©2002 by Prentice Hall, Inc.

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