Echolocation


sonar echolocation illustration

Picture from:
https://askabiologist.asu.edu/echolocation
Porpoises, bats, and several other creatures use echolocation to "see." These creatures use clicking noises that they make to "see" what is around them. These clicking noises reflect off objects and return to the animal as echoes. The animals then piece the echoes they receive back to have an understanding of how far away they are from the things around them. Bats can make 200 clicks per second, which they then use to determine their surroundings. Bats use ultrasonic waves, or waves too high-pitched for the human ear to hear.

Humans have also made their own echolocation known as sonar (SOund NAvigation and Ranging). Sonar was developed in the 1930s so that ships could know the depth of a body of water. Ships could run aground if the water became too shallow. Sonar was also used to find submarines during World War II. Interference of sound waves was used to create a beam so that people could pinpoint where the sound waves went. A submarine could be detected if the sound waves echoed back to the ship too early.


Picture

Picture from:
http://sofiasounds.weebly.com/ultrasonic-sound-and-infrasonic-sound.html

Ultrasonic waves
                  helped produce this two-dimensional image of a
                  developing fetus.

Picture from:
http://science.howstuffworks.com/ultrasonic-mind-control1.htm
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