Which characteristic best describes sound waves?

• A. Transverse waves
• B. Longitudinal waves
• C. Static waves
• D. Electromagnetic waves

Answer: (B)

Sound waves are characterized as longitudinal waves because they consist of compressions and rarefactions that travel through a medium, such as air, water, or solid materials. In longitudinal waves, the particles of the medium move parallel to the direction of the wave's propagation. As sound travels, the areas of compression occur when particles are pushed together, while rarefaction occurs when they are pulled apart.

This movement allows sound waves to transmit energy through the medium without the particles themselves traveling significant distances. This is a fundamental aspect of how we perceive sound; it relies on these pressure changes propagating through air or other materials.

The characteristics of static waves, transverse waves, and electromagnetic waves do not apply to sound. For instance, transverse waves involve particle motion that is perpendicular to the wave direction, which is not the case for sound. Electromagnetic waves do not require a medium and can travel through a vacuum, which is also distinct from how sound waves operate.