What type of wave is formed by a sound wave?
a. transverse wave
b. light wave
c. longitudinal wave
d. water wave

A sound wave is a pressure wave that results from the vibration of the particles o the medium from the source. The motion of the particles in the medium is parallel to the direction of the energy transport. The type of wave formed by a sound wave is the longitudinal wave. The answer is letter C. A longitudinal wave is characterized by rarefactions. When motion is detected from the source, the particle next to it vibrates from its rest position and a progressive change in phase vibration is observed at each particle within that wave. The result is that the energy is transported from one region to the other.