Question

What is the range of frequencies associated with:
ultrasonic sound?

Answer 1

1. The sound waves of frequency greater than $20,000Hz$ are called ultrasonic sound.
2. This means that a particles more than $20,000$ times per second.
3. It cannot be heard by the human ear, but some other animals such as bats, dolphins, dogs etc. can sense ultra sound.
4. It is also useful in various industrial and household applications.

Hence, the range of frequencies associated with ultrasonic sound is more than $20,000Hz$.