Is a sound wave a pressure wave made of compressions and rarefactions?

Is a sound wave a pressure wave made of compressions and rarefactions?

• A. True
• B. False
• C. Not sure
• D. Both

Answer: (A)

Sound waves are longitudinal mechanical waves that propagate as fluctuations in pressure within a medium. In air, particles oscillate parallel to the direction of travel, creating regions of higher pressure (compressions) and regions of lower pressure (rarefactions) as the wave moves through the medium. This alternating pattern of compressions and rarefactions carries the sound energy from the source to the observer. Therefore, a sound wave is indeed a pressure wave made of compressions and rarefactions. (In solids, other wave types can exist, but audible sound in air follows this pressure-wave description.)

Sound waves are longitudinal mechanical waves that propagate as fluctuations in pressure within a medium. In air, particles oscillate parallel to the direction of travel, creating regions of higher pressure (compressions) and regions of lower pressure (rarefactions) as the wave moves through the medium. This alternating pattern of compressions and rarefactions carries the sound energy from the source to the observer. Therefore, a sound wave is indeed a pressure wave made of compressions and rarefactions. (In solids, other wave types can exist, but audible sound in air follows this pressure-wave description.)