This picture shows a longitudinal wave traveling through air.
Which explanation correctly describes the characteristics of
a longitudinal wave traveling through air?
Explanation A: The wave is a mechanical wave, meaning it requires a medium to travel through, and it moves parallel to the direction of the wave.
Explanation B: The wave is an electromagnetic wave, meaning it does not require a medium to travel through, and it moves perpendicular to the direction of the wave.
Explanation A is the correct explanation.