Question

Define echo with example. How does echo change with change in distance?

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Answer 1

Echo is defined as a sound repeating by sound wave reflection, having a lasting or far reaching impact, or repeating what someone else has said. An example of echo is the repeating of a sound created by footsteps in an empty marble hallway. ... An example of echo is a teacher agreeing with and repeating what a parent says.

For example, if the speed of sound in water is 1500 meters per second and the fisherman's sonar device detects an echo in 0.02 seconds, the distance of the object under water will be = v*t = 1500 meters per second * 0.02 seconds = 30 meters (back and forth). That may mean a school of fish are 15 meters away.

Answer 2

Explanation:

echo is the reflection of sound from a certain object that is received 0.1 sec later than direct sound. the distance required is 17m from the object

S=VT

S= 360×0.1÷2

=17m

if the distance is less than 17m confusion occurs between direct sound and echo know as reverberation