Question

Please help if you have the time

Answer 1

We know, length of segment wave is half the wavelength .

Let, wavelength of wave is $\lambda$.

So, length of segment will be $\dfrac{\lambda}{2}$ .

Now, it is given that the string vibrates in four segments.

So,

$L = 4\times \dfrac{\lambda}{2}\\\\L = 2\lambda\\\\\lambda = 1\ m$

Speed can be given by :

$speed = wavelength \times frequency\\\\speed = 1\times 120\ m/s\\\\speed = 120\ m/s$

Therefore, the wave speed in the string is 120 m/s.