(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

When you have an open-closed tube, I was taught in high school that when using the equation

λ = 4L/m, m = 1, 3, 5, 7, ... where m = 1 corresponds to the fundamental mode.

I was taught that m = 1 is the 1st harmonic, m = 3 is the 3rd harmonic, etc.

But my physics prof says m = 1 is the 1st harmonic, m = 3 is the 2nd, m = 5 is the 3rd, and so on. I'm just really confused about which one is right... can anyone explain?

2. Relevant equations

3. The attempt at a solution

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# Harmonics terminology for an open-closed tube

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