The correct answer is D: a longitudinal wave.
In a longitudinal wave, the particles of the medium move parallel to the direction of the wave's travel. In contrast, in transverse waves, the particles move perpendicular to the direction of the wave.
What do we call waves which “move the medium parallel to the direction in which the waves travel””?
A:
a transverse wave
B:
a mechanical wave
C:
an electromagnetic wave
D:
a longitudinal wave
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