Standing waves. What is a harmonic? - YouPhysics
https://www.youphysics.education/standing-waves/harmonics/
WebWhen two interfering waves of equal amplitude, wavelength and frequency travel in opposite directions along a string, the resultant wave is called a standing wave. A standing wave pattern always consists of an alternating pattern of nodes, that never move, and antinodes that undergo simple harmonic motion of maximum amplitude 2A.
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