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Question

A string of length 0.3 m and mass 102 kg is clamped at both its ends. The tension in the string is 1.2 N. When a pulse travels along the string, the shape the string is found to be the same at times t and t+Δt. The minimum value of Δt is 12k s. Find the value of k. ___

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Solution

The string has same shape in figures first and last.
The distance travelled by the pulse (between these two situations)
=2×0.3=0.6 m

v=Tμ=1.2102/0.3=6 ms1
Δt=0.66=0.1=12×5s
k=5

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