Sound waves are introduced to a medium by a vibration. For example, a vibrating guitar string forces surrounding air molecules to be compressed and expanded. This creates a pressure disturbance consisting of an alternating bands of compressions and rarefactions. The vibration travels from particle to particle through the medium, transporting energy as it moves. The amount of energy which is transported past a given area of the medium per unit of time is known as the intensity of the sound wave and is reported as power area . All BUT one of these factors influence the intensity of a sound wave. That is A) the density of the medium. B) the amplitude of the wave. C) the source of the sound wave. D) your distance from the sound source.