Respuesta :
Answer:
a. Longitudinal waves
Explanation:
Waves can be classified into two different types:
- Transverse waves: in transverse waves, the vibration of the medium occurs in a direction perpendicular to the direction of propagation of the wave. An example of transverse waves are electromagnetic waves.
- Longitudinal waves: in longitudinal waves, the vibration of the medium occurs in a direction parallel to the direction of propagation of the wave. Sound waves are examples of longitudinal waves, because they are produced by the motion of the air particles (or of the particles of the medium) which oscillate back and forth along the direction of propagation of the wave.
Therefore, the correct answer is
a. Longitudinal waves