Question

Define echo . write the four necessary conditions for producing echo

Answer 1

Echo is something which happens when a voice hangs on multiple Times and It comes repeatedly for some seconds.

For Making an echo we need a room with nothing just four walls nothing else.

Answer 2

the phenomenon of repetition of sound is called echo.
1. there should be reflection of sound.
2. there should not proper ceilings.
3. windows should not covered with curtains.
4.the reflecting source should be some what away.