What is an echo ? state two conditions for an echo to be heard. bats cannot see then how do they catch their prey ? explain?
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The repetition of sound from the source and after reflection to the listener .
2 conditions are:
Minimum distance should be 17 m between the source and reflecting surface and the sound should be loud enough so that it can be heard after reflection.
2 conditions are:
Minimum distance should be 17 m between the source and reflecting surface and the sound should be loud enough so that it can be heard after reflection.
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