Question

12. What is an echo? How it is produced?
( Ch.- 13 Sound)​

Answer 1

Answer:

The repetition of sound caused by the reflection of sound is called echo. An echo is produced when sound is reflected from a hard surface such as a tall brick wall or a cliff.

Answer 2

Echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is proportional to the distance of the reflecting surface from the source and the listener. To hear the distinct echo the time interval between the original sound and reflected one must be at least 0.1s