An echo is an example of which sound phenomenon?

An echo is an example of the reflection of sound because it occurs when sound waves bounce off a surface and return to the listener, allowing them to hear the sound again after a brief delay. This phenomenon relies on the principles of wave behavior, where sound waves travel through a medium, hit a reflective surface, and reflect back into the environment. Echoes are commonly experienced in locations where sound waves can easily travel across open spaces and reflect off hard surfaces, such as mountains or large buildings.

In this context, it's crucial to recognize that while other sound phenomena like refraction, diffraction, and absorption involve different interactions of sound waves, they do not specifically describe the mechanism behind echoes. Refraction pertains to the bending of sound waves as they pass through different media, diffraction relates to the spreading of sound waves when they encounter obstacles or openings, and absorption involves the reduction of sound intensity as energy is absorbed by materials. Thus, the reflection of sound is the correct term that accurately describes the occurrence of an echo.