The 2nd harmonic

Sound and light waves travel in patterns which can be demonstrated by the movement of a Slinky. Two main components of a wave are antinodes and nodes. The antinodes are located at the high and low points. The nodes are found half way between the antinodes where the movement is zero. The first harmonic has two nodes at each end and one antinode in the middle, forming a single hill or trough. The second harmonic is a full wavelength, composed of three nodes and two antinodes, as pictured.

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