(term) Standing Wave

A standing wave, also known as a stationary wave, is a wave that remains in a constant position.

This phenomenon can occur because the medium is moving in the opposite direction to the wave, or it can arise in a stationary medium as a result of interference between two waves traveling in opposite directions. In the second case, for waves of equal amplitude traveling in opposing directions, there is on average no net propagation of energy.
Standing waves in resonators are one of the causes of the phenomenon known as resonance.

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