Translations:Sinusoidal waves/69/en

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which commonly is expressed in radians per meter. We see that the angular wavenumber is the same quantity we previously called the propagation number. The wavelength, wavenumber, period, and frequency all describe aspects of the repetitive nature of a wave in space and time. These concepts can be applied to waves that are not sinusoidal, as long as each wave is made up of a regularly repeating pattern (i.e., of periodic waves, examples of which are shown in Figure 5).