Question

fill in the blanks,
ultrasonic sound frequency ………..​

Answer 1

Answer:

more than 20k Hertz hope this is right answer

Answer 2

Answer:

In physics the term “ultrasound” applies to all acoustic energy with a frequency above human hearing (20,000 hertz or 20 kilohertz). Typical diagnostic sonographic scanners operate in the frequency range of 2 to 18 megahertz, hundreds of times greater than the limit of human hearing.