Interference

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Interference

Interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.

(...)

If a crest of a wave meets a crest of another wave of the same frequency at the same point, then the magnitude of the displacement is the sum of the individual magnitudes – this is constructive interference. If a crest of one wave meets a trough of another wave then the magnitude of the displacements is equal to the difference in the individual magnitudes – this is known as destructive interference.

Interference (wave propagation) on Wikipedia