A piano wire having a diameter of 0 .90 mm is replaced by another wire of the same material but with a diameter0 .93mm. If the tension of the wire is kept the same, then the percentage change in the frequency of the fundamental tone is
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a
+3%
b
+3.2%
c
-3.2%
d
-3%
answer is C.
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Detailed Solution
kt D be the diameter of the wire. Thennâ1D or dnâdDD2 dnn=dDD=â0â 030â 90 or dnnÃ100=â0â 030â 90Ã100=â3â 2%