What is the properties of echo?

An echo is a reflection of sound that arrives at the listener after a delay, typically occurring when sound waves bounce off surfaces like walls or mountains. Key properties of an echo include its delay time, which depends on the distance the sound travels, and its intensity, which diminishes with distance due to absorption and scattering. Echoes are more pronounced in environments with hard, flat surfaces that facilitate reflection. The phenomenon is commonly used in various applications, such as sonar and architectural acoustics.