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18 May, 20:02

Two of the three tuning forks have known frequencies. When a 510 Hz. fork and the unknown fork are struck together, four beats per second are heard. When a 505 Hz. fork is struck with the unknown fork, beats are produced that are too numerous to count accurately. What is the frequency of the unknown fork?

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  1. 18 May, 20:07
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    4 Hz is the difference between 510 and the unknown.

    Therefore the unknown is either 514 or 506.

    If 505 and 506 were struck together, the diff would be 1 Hz

    If 505 and 514 were struck toghether, the diff would be 9 Hz which would be difficult to count accurately,

    Therefore the unknown is 514
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