Which of the following is an example of a longitudinal wave

D. Sound waves

Explanation:

The following options are missing:

A. radio wave

B. X-rays

C. Light waves

D. Sound waves

There are two kinds of waves: longitudinal and transverse.

In longitudinal waves, the vibrations are parallel to the direction of wave travel. Examples of longitudinal waves include: sound waves and ultrasound waves.

In transverse waves, the vibrations are at right angles to the direction of wave travel. All electromagnetic waves (e. g. light waves, microwaves, radio waves and X-rays) are transverse waves.

Examples of longitudinal waves include: sound waves. ultrasound waves. seismic P-waves.