Trough
Definition
The trough is the lowest point of a wave, where the displacement of the medium is at its minimum.
Analogy
Picture yourself floating in an inflatable pool tube. When you sink down into the lowest part of a wave, that's like being in a trough - it's as low as you can go!
Related terms
Crest: The crest is the highest point of a wave, where the displacement of the medium is at its maximum.
Amplitude: The amplitude is the maximum displacement from equilibrium in a wave.
Frequency: Frequency refers to how many complete waves pass by per unit time.
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