Plane Waves in Air
Figure B.9 shows a 2D cross-section of a snapshot (in time)
of the sinusoidal plane wave






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Figure B.10 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.
The direction of travel and spatial frequency are indicated by the
vector wavenumber
, as discussed in in the following section.
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Vector Wavenumber
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Air Absorption