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2015-02-13T10:29:20+05:30

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Two conditions for echo to be heard are-
the distance between the origin of sound and reflecting object much be atleast 17m.
And the reflecting object must be bigger then the wavelength of the sound.
Bats cannot see so the produce a type of sound and listen to it's echo and hence locate and catch its prey
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2015-02-13T11:03:39+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Reflection of sound is known as echo .

The two conditions for echo to be heard are : 
1.) The min distance b/w sourrce and reflecting surface should be 17.2 metres.

2.)To hear a distinct echo, The interval b/w Original and reflected sound must be 0.1 sec.

Bats can not see still they catch their prey as they produce ultrasonic sound waves.This ultrasound is reflected back to the bat if their is any obstacle in its way and thus bats catch their prey..
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