Standing Waves on a String

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Standing wave occurs when incoming and reflected waves interfere with each other. It produces a wave pattern that appears to be stationary.
Nodes are locations where particles of the medium appear to be at rest. And, antinodes are locations where particles of medium move with the greatest speed.
In musical instrument, fundamental frequency is frequency that produces the simplest standing wave. In the case of strings, the shorter the string, the higher the frequency.