Pls answer

a longitudinal wave is

a wave that the medium is displaced perpendicular to the direction of the wave, such as a sound wave in the air.

a wave that the medium is displaced parallel to the direction of the wave, such as waves on a string.

a wave that the medium is displaced perpendicular to the direction of the wave, such as waves on a string.

a wave that the medium is displaced parallel to the direction of the wave, such as a sound wave in the air

A Longitudinal Wave is _____.

D.a wave that the medium is displaced parallel to the direction of the wave, such as a sound wave in the air

Explanation:

Sound : It is the mechanical energy that causes sensation of hearing to the ear.

Sound is produce by the vibrating objects .

Vibration : To and fro motion of the object.

The vibrating motion of particle creates two region of air pressure:

Hence , Sound wave travels by forming compression and rarefaction.

This disturbance in particles of air  is called : Wave

The waves are classified into two parts :

1. Longitudinal wave : These are those waves in which particles of medium travel parallel to the propagation of the wave.They both travel in same direction.

Sound wave is longitudinal wave

2. transverse wave : These are those wave in which particle of medium travel perpendicular to the direction of wave . If particles travel along x-axis then wave along y or z- axis.

example : Light (or electromagnetic wave) is transverse wave

Look at the attached images :

the volume increases