What is an echo

1. What is an echo?
2. State two conditions for an echo to take place.

Answer

Clear and distinct sound heard after its reflection from a rigid surface is called an echo.

The reflecting surface should be present at least 16 to 18 m from the source of sound OR the sound should be reflected back after 0.1 s.

The size of the reflecting surface should be greater than the wavelength of sound wave.