Question

What is an echo ? What factors are important to get a distinct echo ?​

Answer 1

Answer:

Echo is repulsion of sound

And an empty region must be there for echo

Answer 2

Answer:

The repetition of sound caused by its reflection of a hard surface is known as echo. Factors important to get a distinct echo are:

The minimum distance between the source and reflector of sound should be 17m.

The size of reflector must be large enough as compared to the wavelength of the sound wave.