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Q.

The fundamental frequency of a sonometre wire is n. If its radius is doubled and its tension becomes half, the material of the wire remains same, the new fundamental frequency will be 

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a

n2

b

n

c

n22

d

n2

answer is D.

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Detailed Solution

n=12lTπr2ρ⇒n∝Tr

⇒n2n1=r1r2T2T1=12×12=122

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