An accurate and reliable audio oscillator is used to standardize a tuning fork. When the oscillator reading is 514, two beats are heard per second. When the oscillator reading is 510, the beat frequency is 6 Hz. The frequency of the tuning fork (in Hz) is
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With frequency 514 Hz, two beats are heard. Therefore, frequency of tuning fork can be either 512 Hz or 516 Hz. With 510 Hz, it gives beats of frequency 6 Hz. Hence, frequency of tuning fork is 516 Hz.
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