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Tuning fork P of frequency 260 Hz gives ...

Tuning fork P of frequency 260 Hz gives 8 beats per sec with a tuning fork R. prongs of R are filed a little . When P and R are again sounded 6 beats per second are heard. Frequencies of R before and after filing respectively are

A

252 Hz and 254 Hz.

B

268 Hz and 266 Hz

C

266 Hz and 254 Hz

D

254 Hz and 266 Hz

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The correct Answer is:
A
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