What is the distance between identical points on successive waves called?

• A. Frequency
• B. Wavelength
• C. Amplitude
• D. Period

Answer: (B)

The distance between identical points on successive waves is called the wavelength. This is the spatial period of a wave—the measure from one repeating feature, like a crest or a trough, to the next one along the direction the wave travels. Wavelength is measured in meters and helps determine how the wave behaves; for example, it relates to speed and frequency through the equation speed = frequency × wavelength.

To keep these ideas straight: frequency is how many cycles pass a point each second, period is the time for one complete cycle, and amplitude is how tall the wave is from its rest position. The wavelength specifically describes how far apart identical points are in space.