Question

how is particle displacement related to the direction of wave movement in a longitudinal wave? perpendicular to parallel to above opposite to

Explanation:

In a longitudinal wave, particles move in the same direction as the wave propagates. This is a fundamental characteristic of longitudinal waves. For example, in a sound wave (a type of longitudinal wave), air particles vibrate back - and - forth along the direction the sound wave is traveling.

Answer:

B. parallel to