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Wavelength refers to the length or distance between two identical points of neighboring cycles of a wave signal traveling in space or in any physical medium. The length is measured in distance specifications such as meters, centimeters or millimeters. The wavelength of a signal is inversely proportional to its frequency, that is, the higher the frequency, the shorter the wavelength.
Wavelength depends on the medium the wave is traveling. Wavelength is a concept most often used to describe sinusoidal or nearly sinusoidal waves because it does not get deformed during its propagation and, hence, the laws of a linear system can be applied on it wherever in space. Wavelength is a characteristic of a wave in space, which also depends on the frequency of the wave. The frequency for a sinusoidal wave remains constant, whereas the phase (and sometimes amplitude) of a wave does change. Concepts like superimposition do not change the wavelength and frequency of a sinusoidal wave, which depends only on its source of production.