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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