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A node is a point along a standing wave where the wave has minimal amplitude. The opposite of a node is an antinode, a point where the amplitude of the standing wave is a maximum. These occur midway between the nodes.

Examples of a type of boundary could be the attachment point of a string, the closed end of an organ_pipe or a woodwind pipe, the periphery of a drumhead, or a transmission line with the end short circuit. In this type, the amplitude of the wave is forced to zero at the boundary, so there is a node at the boundary, and the other nodes occur at multiples of half a wavelength from it: 0, λ/2, λ, 3λ/2, 2λ, ...

In the second harmonic or in the 1st overtone of a vibrating string there are 3 antinodes and 2 nodes.

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Q: How many nodes and antinodes are in a single wavelength of the second harmonic of a vibrating string?
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