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Chapter 17: Q42P (page 509)
A sound wave in a fluid medium is reflected at a barrier so that a standing wave is formed. The distance between nodes is , and the speed of propagation is. Find the frequency of the sound wave.
The frequency of the wave is
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The source of a sound wave has a power of . If it is a point source, (a) what is the intensityaway and (b) what is the sound level in decibels at that distance?
Two trains are traveling toward each other at 30.5m/srelative to the ground. One train is blowing a whistle at 500Hz. (a) What frequency is heard on the other train in still air? (b) What frequency is heard on the other train if the wind is blowing at 30.5m/stoward the whistle and away from the listener? (c) What frequency is heard if the wind direction is reversed?
The sixth harmonic is set up in a pipe. (a) How many open ends does the pipe have (it has at least one)? (b) Is there a node, antinode, or some intermediate state at the midpoint?
A sinusoidal sound wave moves atthrough air in the positive direction of an xaxis. At one instant during the oscillations, air molecule Ais at its maximum displacement in the negative direction of the axis while air molecule Bis at its equilibrium position. The separation between those molecules is, and the molecules between Aand Bhave intermediate displacements in the negative direction of the axis. (a) What is the frequency of the sound wave?
In a similar arrangement but for a different sinusoidal sound wave, at one instant air molecule Cis at its maximum displacement in the positive direction while molecule Dis at its maximum displacement in the negative direction. The separation between the molecules is again, and the molecules between Cand Dhave intermediate displacements. (b) What is the frequency of the sound wave?
Two identical tuning forks can oscillate at . A person is located somewhere on the line between them. Calculate the beat frequency as measured by this individual if (a) she is standing still and the tuning forks move in the same direction along the line at, (b) the tuning forks are stationary and the listener moves along the line at .
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