Question

How long it will take a wave travelling from one end of 85 m long and 5 kg wire to the other end if the tension of 300 N is applied?

Answer 1

The speed of the wave

$$v=\sqrt{\frac{T}{\mu}}=\sqrt{\frac{T}{m/l}}=\sqrt{\frac{300N}{5kg/85m}}=71.4\: m/s$$

The time of a wave traveling

$$t=\frac{l}{v}=\frac{85\: m}{71.4\: m/s}=1.2\: s$$