The amplitude decreases.
<h3>What is Interference?</h3>
the combined result of two or more wave trains travelling in parallel or coincident directions. The result is the result of adding the individual wave amplitudes at each place that is influenced by multiple waves, called interference.
types of interference -
When the crests of two waves overlap, constructive interference takes place. The illustration above depicts what occurs. The crests of the waves merge as they pass past one another to create a wave with a larger amplitude. The similar thing can occur when two troughs interact.
When two wave's maxima are 180 degrees out of phase, destructive interference happens: a positive displacement of one wave is precisely cancelled by a negative displacement of the other wave. The resultant wave has zero amplitude.
When one wave crest overlaps the crest of another and they add together what happens to the amplitude decreases.
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