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When a tuning fork A of unknown frequenc...

When a tuning fork A of unknown frequency is sounded with another tuning fork B of frequency 256Hz, then 3 beats per second are observed. After that A is loaded with wax and sounded, the again 3 beats per second are observed. The frequency of the tuning fork A is

A

250 Hz

B

253 Hz

C

259 Hz

D

262 Hz

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The correct Answer is:
C
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