If one acoustic variable oscillates rhythmically, the wave is a ____.

If one acoustic variable oscillates rhythmically, the wave is a ____.

• A. Not a wave
• B. Heat wave
• C. Sound wave
• D. Tsunami wave

Answer: (C)

When an acoustic variable oscillates rhythmically, it creates a propagating disturbance in the medium, which is a sound wave. An acoustic variable—such as pressure, density, or particle displacement—varying in a regular, periodic way produces alternating regions of compression and rarefaction that travel through the medium, carrying energy from the source. In air, this shows up as the familiar longitudinal sound wave, where the particles oscillate mainly along the direction of travel. The other options don’t fit because a heat wave isn’t a mechanical wave arising from acoustic fluctuations, a tsunami is a surface water wave driven by gravity, and the idea of “not a wave” contradicts the traveling disturbance produced by the rhythmic oscillation.

When an acoustic variable oscillates rhythmically, it creates a propagating disturbance in the medium, which is a sound wave. An acoustic variable—such as pressure, density, or particle displacement—varying in a regular, periodic way produces alternating regions of compression and rarefaction that travel through the medium, carrying energy from the source. In air, this shows up as the familiar longitudinal sound wave, where the particles oscillate mainly along the direction of travel. The other options don’t fit because a heat wave isn’t a mechanical wave arising from acoustic fluctuations, a tsunami is a surface water wave driven by gravity, and the idea of “not a wave” contradicts the traveling disturbance produced by the rhythmic oscillation.