# Translations:Useful attenuation mechanisms/1/en

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A traveling sine wave has the form , where *f*, *t*, , and *x* are, respectively, the temporal frequency, time, spatial frequency (or wavenumber), and distance. The period is *T* = 1/*f*, and the wavelength is . During one period of time, the wave travels one wavelength of distance. Thus, the wave velocity is equal to wavelength over period. The wave velocity is specified by any of the expressions