Question

vibrations of frequency higher than 20,000Hz

Answer 1

Answer:

Hello mate✌✌✌

They are called super-sonic sounds.

Hope it helps✌✌✌

Answer 2

Answer:

sounds of frequencies higher than about 20,000 vibrations per second (20 kHz) are also not audible to the human ear.these virbrations are called ultrasonic sounds.

hope this helps...