Question

question 29
1 pts
in a longitudinal wave, the motion of the particles is ______ the waves direction of propagation.
perpendiculat to
opposite from
parallel to
along

Explanation:

In a longitudinal wave, the particles of the medium vibrate in the same direction as the wave is propagating. For example, in a sound wave (a type of longitudinal wave), air molecules move back and forth parallel to the direction the sound wave travels. In contrast, in a transverse wave (like a wave on a string), particles move perpendicular to the wave's direction of propagation. The term "along" is too vague compared to "parallel to" which precisely describes the relationship between particle motion and wave - propagation direction in a longitudinal wave.

Answer:

C. parallel to