Question

1. What is an echo?

2. State two conditions for an echo to take place.

Answer 1

1. Echo:- Sound follows the law of reflection of sound, if we create a sound and we heard that sound after a time when sound reflects back from any object or cliff, this phenomenon is called echo.

2. Two conditions for an echo to take place.

1. The distance between the source of sound and the object should be at least $17m$
2. The reflected sound takes at least $0.1$to reach the source.