Question

multiple choice question
longitudinal waves cause vibrations to occur in

a direction perpendicular to their motion
all directions
a direction parallel to their own movement

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Explanation:

Longitudinal waves are characterized by particle vibrations that are parallel to the direction of wave propagation. Transverse waves have vibrations perpendicular to wave motion. "All directions" is incorrect as waves have specific vibration - direction relationships.

Answer:

a direction parallel to their own movement