Question

What is an echo?

• A. Reflection of sound reaching to the listener some time after the original sound
• B. Reflection of sound reaching to the listener before original sound
• C. Reflection of sound reaching to the listener along with original sound
• D. Reflection of sound not reaching to the listener

Answer 1

The correct option is A

Reflection of sound reaching to the listener some time after the original sound

When we shout in front of any obstacle (cliff, wall etc.) the sound reflects from the obstacle and comes back. So we hear the reflected sound when the original sound has ceased. This reflected sound is called an echo.