Evanescent wave:
A physically accurate particle motion animation of an evanescent wave is given here. Two oppositely travelling waves in a membrane with kx=+2k and -2k forming a standing wave were taken. Assumed values: speed of sound = 340 m/s, frequency = 1000 Hz, density of medium = 1.23 kg/m^3
Propagating wave:
If kx is +k/2 and -k/2 , the wave would propagate in the positive z.
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