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You hear two sounds coming from two different places, each source produces a tone of a...

You hear two sounds coming from two different places, each source produces a tone of a single frequency. You hear a pulsing pattern and notice that over a period of 10 seconds the pattern repeats 20 times. The first frequency is 460 Hz. What is the frequency of the second source? Note, there may be more than one frequency for the second source.

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