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When human vocal cords are used to sing falsetto , the result is a very pure sound, relatively free of overtones. Assume two singers are

When human vocal cords are used to sing falsetto, the result is a very pure sound, relatively free of overtones. Assume two singers are singing falsetto, attempting to produce a note with frequency 4050 hertz, but a beat frequency of 7 Hz is heard.

By how many hertz is the frequency of the sound produced by the higher note higher than the frequency of the combined sound?

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