Echo, from the Greek word “” (ch), refers to a sound or series of sounds caused by the reflection of sound waves from a surface back to the listener. It is a common acoustic phenomenon that occurs when sound waves bounce off hard surfaces, such as walls, mountains, or even clouds, and return to the source. The reflected sound can be perceived as a repetition of the original sound, creating an auditory effect known as an echo.
Echoes can vary in duration and intensity depending on the distance between the sound source and the reflecting surface. In some cases, echoes can be beneficial, such as in sonar systems used for underwater navigation and imaging. In other cases, echoes can be undesirable, such as in concert halls or auditoriums where they can interfere with the clarity of sound.
