Question

when the oscillation of the particles in a medium is parallel to the direction of the waves motion, what type of wave is this?

longitudinal wave
transverse wave

Explanation:

Define wave types based on particle oscillation direction

A wave in which the oscillation of the medium's particles is parallel to the direction of the wave's propagation is defined as a longitudinal wave.

Contrast with transverse waves

A wave in which the oscillation of the medium's particles is perpendicular to the direction of the wave's propagation is defined as a transverse wave.

Answer:

• longitudinal wave (Correct answer)
• transverse wave