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65 tuning forks are arranged in ascendin...

65 tuning forks are arranged in ascending order of their frequencies . Any two successive forks produce 8 beats per second when vibrated together. The first and the last tuning forks are in unison with the fundamental and the third harmonic emitted from a stretched string, respectively.What is the frequency of the first tuning fork ?

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The correct Answer is:
256 Hz
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