What does wavelength measure?

Wavelength is defined as the distance between successive crests or troughs in a wave. This measurement captures the spatial period of a wave, which is a fundamental characteristic in wave physics. By measuring the distance that occurs between points of equal phase in a wave (like from one crest to the next crest or from one trough to the next trough), we can understand how the wave propagates through space.

In contexts such as sound, light, and water waves, wavelength helps determine various properties of the wave, including its frequency and speed, through the wave equation. Thus, the correct understanding of wavelength is crucial for anyone studying wave phenomena, as it is integral to relating the physical characteristics of waves to their behavior in different mediums.