Ultrasonic sound
Sound waves with frequencies above the normal range of hearing for people are called ultrasound. Dolphins use ultrasound waves with frequencies up to 150,000 Hz to hunt and move through the water, and bats use ultrasound waves with frequencies up to 100,000 Hz to move around and hunt as well. People use ultrasound technologies, such as ultrasound imaging, to observe things that they are unable to see directly.
What is ultrasound?
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