In physics, wavelength is the spatial period of any periodic wave. It is a measure of the distance between two similar consecutive repeating peaks, valleys, or zero-crossings. It is a characteristic that is applicable for travelling waves, standing waves and in general any spatial wave pattern. Wavelength of a wave is inversely proportional to its frequency and therefore waves with higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths. The range of wavelengths or frequencies for any wave phenomena is what is called a spectrum. Initially it was just used for the visible light spectrum but it is now applicable for the entire electromagnetic spectrum.  The common examples of wave-like phenomena are sound waves, light, water waves and periodic electrical signals in a conductor. It is usually denoted by the Greek letter lambda (?).

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