Sinusoidal wave
This image shows the anatomy of a sine curve: the crest is the peak of each wave, and the trough is the valley; the amplitude is the distance between the crest and the x-axis; and the wavelength is the distance between two crests (or two troughs).
Source
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"Sine_wave_amplitude.svg."
https://commons.wikimedia.org/wiki/File:Sine_wave_amplitude.svg
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