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Q.

Is it true that the principle of echoes is used by bats during their flight at night?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Bats use the principle of echo during their flight at night. This happens because when the bats used to fly, they emit a high frequency of ultrasonic sound, and these sound waves then strike the obstacles and reflect back to the bats, and by the same method, they search for their prey.
 
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