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A tuning fork A produces 4 beats per second with another tuning fork B of frequency 512 Hz. After
the prongs of A are filed a bit, the beats occur at a shorter intervals. What could be the original
frequency of A (before filing)?
[An example on beat frequency is shown for reference in Class notes from 02/22/'21: Chapter 14
(Sound Part 2), Ex 3 & 4 on last page].
512 Hz
O 516 Hz
500 Hz
520 Hz

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