The width of the wave. Hence, option D is correct.
Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.
Wavelength is one way of measuring the size of waves. It is the distance between two corresponding points on adjacent waves, usually measured in meters.
The wavelength of a transverse wave can be measured as the distance between two adjacent crests.
Hence, option D is correct.
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