I've never taken physics before and this is my first physics class in university. 1. The problem statement, all variables and given/known data A string, 2.0 meters in length, is fixed at both ends and tightened until the wave speed is 78 m/s. What is the frequency of the standing wave shown in the figure? 2. Relevant equations v=nv/2L because it is fixed at both ends 3. The attempt at a solution so f = (78m/s)/(2)(2) and I get 19.5 Hz but that's not the right answer. It's too small. Help please?