Many people think bats are blind, but in fact they can see almost as well as humans. As they can make waves similar to ultrasonic waves which spread to specific distance when it Collide with any barrier it reflected and it can receive it to have a complete vision about the barrier distance and size.
Similar to the bat in some projects we need to determine barrier distance and size to avoid it so we have the ultrasonic sensors. These wave’s speed is 345 m /sec at 25˚C in the air its application appears clearly in Submarines, Radars and robots.

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