shows a 2D
cross-section of a snapshot (in time)
of the sinusoidal
in the range
Gray-scale density plot of the
cross-section of a sinusoidal plane wave
, at with vector wavenumber
depicts a more mathematical schematic of a
sinusoidal plane wave traveling toward the upper-right of the figure.
The dotted lines indicate the crests
(peak amplitude location)
along the wave.
Wave crests of the sinusoidal traveling
, for some
fixed time and
in the plane.
The direction of travel and spatial frequency
are indicated by the
, as discussed in in the following section.
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