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Question

The speed of transverse wave v in a stretched string depends on tension T in the string and linear mass density (mass per unit length ) μ. Find the relation using method of dimensions.

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Solution

Given,

Speed=v,Tension=t,Density=mL

So, the velocity is given by,

KLATBMC

So.[M0LT1]=[L]A[MLT2]B[ML]C

[M0LT1]=[MB+CLA+BCT2B]

On computing the coefficient then we get,

B+C=0,A+BC=12B=1

Then we getb=12,c=12,a=0

Thus, V=kTM

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