Question

define echo....... ​

Answer 1

Answer:

hi

Explanation:

echo is a sound producing.

Answer 2

$\Large{\underline{\underline{\bf{Solution :}}}}$

★ Echo :

The sound returning back towards the source after suffering reflection from a distance obstacle (a wall, a row of building etc.) is called an echo.

When the sound is reflected repeatedly from a number of obstacles, more than one echoes, called multiple echoes are heard. Multiple echoes may be heard one after the other when sound gets repeatedly reflected from distant high rise buildings or hills. The rolling of thunder is an example of multiple echo formation.

The two soundsone direct and the other echo, can be heard distinctly provided the distance between the observer and the reflecting surface is large enough to allow the reflected sound to reach him without interfering with the direct sound. Since the sensation of sound persists for 1/10 second after it is produced, the echo can be heard distinctly only if it reaches at least 1/10 second after the original sound is produced.