Ok, I was given a question in homework and was never told the right answer. If the Fundamental Frequency = 15Hz, the 3rd Harmonic = ? I estimated it at 45Hz because of an example The example was; Harm 1 = 100 x 1 = 100Hz Harm 2 = 100 x 2 = 200Hz Harm 3 = 100 x 3 = 300Hz If so, the third Harm is 3:1, Ergo, if Harm 1. WAS 15Hz, you'd use the 3:1 which was applied on the example and discover it was 45Hz. Am I correct in saying this or is it something different?