What is the frequency of ultrasonic waves?

The frequency of ultrasonic waves is typically above the range of human hearing, which is generally considered to be from 20 Hz to 20,000 Hz (20 kHz). Ultrasonic waves have frequencies higher than 20 kHz, ranging from around 20 kHz to several gigahertz (GHz). Common applications of ultrasonic waves include medical imaging, non-destructive testing, industrial cleaning, and distance measurement. The specific frequency used depends on the application requirements and the technology being employed.