First Harmonic

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a grid of dots with the words first harmonic or fundamental frequency at the top
a drawing of a harmonic or 1st overtone
a man and a woman are standing next to each other and the woman is making an angry face
a diagram showing the first harmonic or fundamental frequency and a pipe side view
a computer generated image of a second harmonic or 1st overtone pipe
a woman in a black suit is sitting at a table with bottles of water and cups .