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प्रश्न
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उत्तर
Bats make a series of twittering sound, so high pitched that human ear can not hear. These sound waves strike against the obstacles less in their path of flight and send back echoes to the bat’s ear. The echoes tell the bats, how they must turn in the air to avoid colliding with the obstacles or with one another.
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संबंधित प्रश्न
Guess which sound has a higher pitch: guitar or car horn?
Fill in the blank.
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200 Hz
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