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Bats detect obstacles in air by producing ultrasonic sound and hearing echo . The minimum distance of the reflector in a air must be 17 m according to formula 2D/t so how will bat detect obstacles if the obstacle is at a distance less than 17 m.
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he would detect it by hearing it getting reflected from other object around it .
he will get an idea as he would detect it before reaching less then 17m
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