1. The problem statement, all variables and given/known data The end of a stretched string is forced to vibrate with a transverse displacement with A= 0.30 m and ω = 9.0 rad s-1. If the tension of the string is T = 4.0 N, and the mass per unit length is µ= 1.250 g m-1, calculate (a) the wave velocity, (b) the frequency of oscillation, (c) the wavelength, and (d) the displacement of the string at x = 2.0 m from the source at the time t = 100 ms after the oscillation commences. Assume that the wave is travelling from left to right. The attempt at a solution a.) v=√(T/μ) giving me a wavespeed of 56.6 ms-1 b.)ω=2∏f giving me a frequency of 1.43 Hz c.)v=fλ giving me a wavelength of 39.6 m d.)This is where I'm stuck :( I would think of using the equation vertical displacement, y=Asin(kx-ωt) except I don't know how to find k Any help appreciated.