What is an echo

Sound (10)
  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.

  • Exam Year: 2016