Question

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a wire is 4 m long and has mass 0.2 kg the wire is kept horizontally to transfer pulse is generated by plucking one end of the taut wire. the pulse makes 4 trips back and forth along the wire in 0.8 s. the tension in the wire will be..??

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Answer 1

Speed of sound in wire is given by

C=√{T/μ}

μC2=T

Here we have

C=4/0.8 m/s = 5 m/s

and

μ=0.2/4=0.05 kg/m

So tension

T=μC2=0.05×52=1.25 N

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