When guitar strings A and B are plucked at the same time, a beat frequency of 2

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When guitar strings A and B are plucked at the same time, a beat frequency of 2 Hz is heard. If string A is tightened, the beat frequency increases to 3 Hz. Which of the two strings had the lower frequency initially?
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Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

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