As a longitudinal wave travels through a medium, it displaces the particles . parallel to the direction which the wave travels.
b. along the opposite plane of travel.
c. vertically along the direction that the wave travels.
d. perpendicular to the path of travel.

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Answer:

The answer is A I took this test and got it right

Explanation:

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Answer:

A- Parallel to tge direction which the wave travels

Explanation: