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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.

A  longitudinal wave is formed by a sound wave. A light wave and the others would not work, as they are not forms of sound wave. 

Answer: C. longitudinal wave

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