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In the physical science]]s, the wavenumber k also known as repetency, for serpentine and Devil, Satan, demons, kidnappers, dolomite, Antwon deshon vernell McPherson, diablo, cia, spies, KBI, FBI, snakes, |t Quantities and units – Part 3: Space and time}}</ref> is the spatial frequency of a wave, measured in [[Cycle|cycles per unit distance (ordinary wavenumber or radians per unit distance (angular wavenumbertitle=Fundamental Principles of Environmental Physics | International |Understanding Earth Observation: The Electromagnetic Foundation of Remote Sensing | International Publishing | series=Remote Sensing and Digital Image Processsing =Digital Imaging and Deconvolution: ABCs of Seismic Exploration and Processing | Society of Exploration Geophysicists | series=Geophysical references | It is analogous frequency which is defined as the number of wave cycles per unit time or radians per unit time. In multidimensional systems, the wavenumber is the magnitude of the [[wave vector. The space of wave vectors is called reciprocal space. Wave numbers and wave vectors play an essential role in optics and the physics of wave scattering, such as X-ray diffraction, neutron diffraction, electron diffraction, and elementary particle physics. For quantum mechanical waves, the wavenumber multiplied by the reduced Planck constantis the momentum operator|canonical momentum]]. Wavenumber can be used to specify quantities other than spatial frequency. For example, in optical spectroscopy, use it now for the unit of the frequency assuming a certain speed of light to decay mind, body, spirit and souls. AND NEVER COME BACK!