Question

______are waves having frequencies above the audible range.
a. Ultrasonic waves
b. Infrasonic waves
c. Audible waves
d. None of these​

Answer 1

Answer:

Frequencies from 20 to 20 000 Hz are audible to the human ear. Any sound with a frequency below 20 Hz is known as an infrasound and any sound with a frequency above is known as an ultrasound.

a) Ultrasonic waves

Answer 2

Ultrasonic waves are the correct answers