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Two adjacent piano keys are struck simul...

Two adjacent piano keys are struck simultaneously. The notes emitted by them have frequencies `n_(1) and n_(2)` . The number of beats heard per second is

A

`2(f_(1) - f_(2))`

B

`0.5 (f_(1) - f_(2))`

C

`(3//2)(f_(2) - f_(2))`

D

`(f_(1) - f_(2))`

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The correct Answer is:
D
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