Question

4. Sound waves of frequencies above 20,000 Hz are called.
. waves.
a. Ultrasonic
b. Supersonic
c. Infrasonic
d. Panasonic​

Answer 1

Answer:

Here is your answer

Explanation:

a. ultrasonic sound

Answer 2

ultrasonic

Explanation:

The units of frequency are called hertz (Hz). Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. Frequencies above 20,000 Hz are known as ultrasound