Question

A string of mass $2.5kg$ is under a tension of $200N$. The length of the stretched string is $20.0m$. If the transverse jerk is struck at one end of the string, the disturbance will reach the other end in

• A. One second
• B. $0.5$ second
• C. $2seconds$
• D. Data given is insufficient

Answer 1

The correct option is B $0.5$ second

Here,

$m=2.520kg/m,T=200N$

$v=\sqrt{\frac{T}{m}}$

$v=\sqrt{\frac{200\times 200}{25}}$

$v=40$

Time taken.

$t=\frac{l}{v}$

$t=\frac{20}{40}$