The distance between two successive crests or troughs of a wave is called ______?

لہر کے دو سروں یا گرتوں کے درمیان فاصلہ ______ کہلاتا ہے؟

Frequency

Amplitude

Velocity

Wavelength

Wavelength is the distance between two consecutive points on a wave that are in phase with each other.
Such as two crests or two troughs.