The crest is the highest point of a wave, where the displacement of the medium is at its maximum.
Imagine you're on a roller coaster ride and you reach the top of a hill. That highest point is like the crest of a wave, where things are at their peak.
Trough: The trough is the lowest point of a wave, where the displacement of the medium is at its minimum.
Amplitude: The amplitude is the maximum displacement from equilibrium in a wave.
Wavelength: The wavelength is the distance between two consecutive crests or troughs in a wave.
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