Respuesta :
In a Longitudinal wave, the direction of the wave motion is parallel to the direction of the energy transfer. The correct blanks are parallel and perpendicular.
Longitudinal wave:
- In this direction of the wave motion is parallel to the direction of the energy transfer.
- It requires a medium to travel.
Transverse wave:
- In this direction of the wave motion is perpendicular to the direction of the energy transfer.
- It does not require any medium.
Therefore, the correct blanks are parallel and perpendicular.
To learn more about the longitudinal wave,
https://brainly.com/question/11398784