what is ultrasonic frequency
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Sounds with a frequency of 20 kHz and higher are referred to as ultrasound (or ultrasonic sound). High frequency sound is sound of which the frequency lies between 8 and 20 kHz
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High-frequency sound waves such as ultrasonic waves are measured in thousands of cycles per second, or kilohertz (kHz). Ultrasound starts at the upper limit of human hearing, approximately 20 kHz. Many animals can hear above this range, such as dogs and bats, and some, such as dolphins, communicate using it.
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