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A sonometer wire resonates with a given ...

A sonometer wire resonates with a given tuning fork forming standing waves with five antinodes between the two bridges when a mass of 9 kg is suspended from the wire. When this mass is replaced by a mass M, the wire resonates with the same tuning fork forming three antinodes for the same positions of the bridges. The value of M is

A

25 kg

B

5 kg

C

12.5 kg

D

1/25 kg

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