What is the definition of wavelength?

Wavelength is defined as the distance from one peak to the next peak in a wave. This measurement is crucial in understanding wave behavior, as it determines various properties of waves, such as frequency and energy. In the case of a continuous wave, the wavelength can also be described in terms of the distance between two consecutive crests, which effectively conveys the same concept. However, specifying the distance between peaks is the most precise definition because it applies universally to all types of waves, regardless of their shape.

Measuring the wavelength in this manner allows for a clearer understanding of the periodic nature of waves, which can be useful in various applications, including acoustics and optics. Understanding this definition helps in analyzing wave phenomena, such as interference and diffraction, where the wavelength plays a key role in how waves interact with each other and their environments.