What general frequency range typically defines sound waves categorized as ultrasonics?
Answer
Those above 20 kHz
Ultrasonic technology relies on generating and analyzing sound waves that fall outside the spectrum of human hearing. This upper limit is conventionally defined as frequencies exceeding 20 kilohertz (kHz). While specific applications utilize defined bands within this ultrasonic spectrum—for instance, medical imaging often employs frequencies in the megahertz range (MHz), and modern industrial sensors operate between 20 kHz and 500 kHz—the overarching definition of ultrasonics centers on generating sounds above the 20 kHz threshold to facilitate analysis of returning echoes for distance or presence detection.
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