Answer: The longitudinal wave has a disturbance that is only parallel to the wave motion.
Step-by-step explanation:
The wave has a disturbance that is only parallel to the wave motion. Its wave is defined as a longitudinal wave.
In the longitudinal wave, the particle of the medium moves parallel to the direction of the motion. The longitudinal wave shows the motion of the particle.
The longitudinal wave carries the sound from one point to another point.
Hence, The longitudinal wave has a disturbance that is only parallel to the wave motion.