Question

The sounds of frequency greater than 20,000Hz are called _______. State any one practical

application of this sound.​

Answer 1

Answer:

ultrasound

Explanation:

the sound above 20khz is called ultrasound

fact a human can hear form 20hz to 20khz

Answer 2

Answer:

It is known as Ultrasonic sound

Explanation:

It can be used in a verity of technology that include in the medical and etc.  . It is used in sonar that is present in most ships to detect fish rocks and etc.