Question

why is sound wave called a longitudinal wave ?​

Answer 1

Answer:

The vibration of medium that travel along or parallel to the direction of wave is called a longitudinal wave. In a sound wave, the particles of the medium vibrate in the direction parallel to the direction of propagation of disturbances.

Hence, a sound wave is called a longitudinal wave.

Answer 2

Answer:

Sound waves are called longitudinal waves because the particles of the medium by which the sound is transported in air or in any fluid medium, it vibrates parallel to the direction in which the sound wavemoves.