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Question

A source of sound with adjustable frequency produces 2 beats per second with a tuning fork when its frequency is either 476 Hz or 480 Hz. What is the frequency of the tuning fork ?

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Solution

As the tuning fork produces 2 beats with the adjustable frequency, the frequency of the tuning fork will be

$\Rightarrow n = \frac{(476 + 480)}{2} = 478$

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[NCERT 1977]

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