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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

259 Hz

B

262 Hz

C

250 Hz

D

253 Hz

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