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A source frequency f gives t beats when ...

A source frequency f gives t beats when sounded with a frequency 200Hz. The second harmonic of same source gives 10 beats when sounded with a source of frequency 420Hz. The value of f is

A

`105 s^(-1)`

B

`200 s^(-1)`

C

`210 s^(-1)`

D

`195 s^(-1)`

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The correct Answer is:
A
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