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One way of measuring the frequency of a sound is to make measurements of the interference...

One way of measuring the frequency of a sound is to make measurements of the interference pattern that is created when the sound is produced by two sources. You find that for two sources, the sound is loudest when you are equidistant from the sources. You then determine that there is a minimum in intensity when you are 2.9m farther from one source than the other. What is the frequency of the source? Use the speed of sound of 343m/s in air.

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