When a piano tuner strikes both the A on the piano and a 440 Hz tuning fork, he hears a beat every 2 seconds. The frequency of the piano's A is

The  frequency is          

Explanation:

From the question we are told that

   The frequency of the  tuning fork is  

   The beat period is  

Generally the beat frequency is mathematically represented as

The  beat frequency is also represented mathematically as

Where   is the frequency of the piano

 So

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