Question

what is an echo ? state two conditions for echo to be heared . bats cannot see still they catch their prey . explain ?

Answer 1

sound heard after reflection from a rigid surface is called an echo.
to hear an echo,the listener must be standing 17m away from the rigid surface.
bats can fly unerringly and catch their prey since they produce ultrasonic sound which travel in a medium and reflect back after hitting the obstacle.

Answer 2

An echo can be defined as the sound produced after the reflection of the sound waves.

Explanation:

The two conditions for echo to be heard are as follows:

1. The minimum distance between the source of sound and the obstacle causing reflection of sound should be 17.2 m.

2. The material or reflecting surfaces must not absorb the sound.

The bats cannot see the prey in night but they can still catch the prey as they can hear the echoes produced by the reflection of the waves that strikes the prey. By this the position of the prey can be judged and prey being eaten by the bat.

Learn more about echo:

What is echo ?factors important for echo?: https://brainly.in/question/15546591