1. The problem statement, all variables and given/known data A metal wire is vibrating at its third-harmonic frequency. 0.32 m from one end, the amplitude is equal to one quarter the maximum amplitude. Find the length of the wire. 2. Relevant equations 3. The attempt at a solution I don't quite understand the question, it says 0.32m from one end, is that from the start to the first node? the amplitude going to be 1/4 its maximum where sin(x) = 0.25, correct?