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Tuning fork A and B produce 4 beats when...

Tuning fork A and B produce 4 beats when sounded together. When they are tuned with saem sonometer wire, the resonance length are 128 cm and 130 cm respectively. The frequency of A is :

A

240 Hz

B

250 Hz

C

260 Hz

D

270 Hz

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The correct Answer is:
C
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