Question

what is crest and trough​

Answer 1

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A crest point on a wave with the maximum value of upward displacement within a cycle. A crest is a point on a surface wave where the displacement of the medium is at a maximum. A trough is the opposite of a crest, so the minimum or lowest point in a cycle.

Crest trough.svg

When the crests and troughs of two sine waves of equal amplitude and frequency intersect or collide, while being in phase with each other, the result is called constructive interference and the magnitudes double (above and below the line). When in antiphase – 180° out of phase – the result is destructive interference: the resulting wave is the undisturbed line having zero amplitude.

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Answer 2

Explanation:

crest of a waveform is its peak positive value (maximum value) and trough is its peak negative value (minimum value)

Difference between successive crests (or successive troughs) is the wavelength