The distance between two crests or two troughs on a transverse wave is known as the wavelength.
What is a wavelength?
The wavelength of a periodic wave is its spatial period or the distance over which the wave's structure repeats. It's the distance between two adjacent corresponding points of the same phase on the wave, such as two adjacent crests, troughs, or zero-crossings, and it's a feature of both travelling and standing waves, as well as other spatial wave patterns.
As discussed above the wavelength, therefore, the distance between two crests or two troughs on a transverse wave is known as the wavelength.
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