The differences and common points between propagative and standing
waves are represented in the figure below.
Three waves are displayed in the figure.
The first one, at the top, represents a wave propagating from left to
right (follow a point with a given magnitude).
The second one, in the middel, represents a wave propagating from
right to left.
The third one, at the bottom, represents the addition of the two
previous propagating waves, point to point and time to time. It
appears that this last wave does not propagate.
This wave is an example of standing wave.
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