A string of length 0.29 m is fixed at both ends. The string is plucked and a standing wave is set up that is vibrating at its second harmonic. The traveling waves that make up the standing wave have a speed of 115 m/s. What is the frequency of vibration? fn=n(v/2L) I tried: 2f1=1(115m/s/2*0.29) then 2f1= 198.3 and I have both multiplied the answer by 2 and divided and both answers are wrong. The second harmonic is really throwing me for a loop. I am also confused about the n in the equation. Any help is greatly appreciated!!