Final answer:
In two-dimensional waves, rays can be drawn parallel to wavefronts, not crests. Wave vector defines wave propagation direction. Waves can superimpose without propagating in the same line.
Explanation:
False. When representing waves in two dimensions, a ray can be drawn parallel to the wavefronts of the waves, not the crests.
In two-dimensional waves, the wave vector defines the direction of wave propagation by its orientation perpendicular to the wave fronts.
For waves to superimpose, they do not have to be propagating in the same line, as seen in examples like circular waves in two dimensions.
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