Physics
The frequency of ultrasound wave is typically
Above 20 kHz
Above 20,000 kHz
Below 20 kHz
Below 02 kHz
Above 20 kHz
Ultrasound refers to a sound wave with a frequency greater than the upper limit of human hearing, which is generally over 20 kHz. In general, humans can hear sounds with a frequency between 20 Hz and 20 kHz.
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