Which term best describes a mechanical wave that travels through water and is the basis of underwater sound communication?

Which term best describes a mechanical wave that travels through water and is the basis of underwater sound communication?

• A. Surface Zone
• B. Sofar
• C. Sound
• D. Side-Scan Sonar

Answer: (C)

Sound is a mechanical wave that travels through water as compressions and rarefactions, with particles oscillating along the direction of travel. This makes it the basis of underwater communication because water transmits acoustic energy well, while electromagnetic waves don’t travel far in seawater. The speed of sound in seawater is about 1500 m/s and varies with temperature, salinity, and pressure. The SOFAR channel is a deep ocean layer where sound speed is unusually low, allowing sound to refract back toward the axis and travel long distances—an important feature for long-range underwater communication, but it describes a propagation pathway rather than the wave itself. Side-Scan Sonar uses sound to image the seabed, not the nature of the wave. Surface Zone isn’t a standard term in this context. So, the term that best describes a mechanical wave traveling through water and forming the basis of underwater sound communication is sound.

Sound is a mechanical wave that travels through water as compressions and rarefactions, with particles oscillating along the direction of travel. This makes it the basis of underwater communication because water transmits acoustic energy well, while electromagnetic waves don’t travel far in seawater. The speed of sound in seawater is about 1500 m/s and varies with temperature, salinity, and pressure. The SOFAR channel is a deep ocean layer where sound speed is unusually low, allowing sound to refract back toward the axis and travel long distances—an important feature for long-range underwater communication, but it describes a propagation pathway rather than the wave itself. Side-Scan Sonar uses sound to image the seabed, not the nature of the wave. Surface Zone isn’t a standard term in this context. So, the term that best describes a mechanical wave traveling through water and forming the basis of underwater sound communication is sound.