Question

A string is 7.63 m long with a mass of 8.56 g. The string is held taut with a tension of 457 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?

Answer 1

The speed of wave

$$v=\sqrt{T/(m/L)}\\ =\sqrt{457/(8.56*10^{-3}/7.63)}=638\:\rm m/s$$

The required time

$$t=d/v=3.00/638=4.70\:\rm s$$