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

1. Frequency
2. Amplitude
3. Velocity
4. Wavelength

Wavelength is a fundamental property of a wave, defined as the spatial period of the wave—the distance over which the wave’s shape repeats. It is measured as the distance between two consecutive corresponding points of the same phase on the wave, such as crest-to-crest or trough-to-trough. Frequency is the number of waves per second, amplitude is the wave’s height, and velocity is its speed.