A. Audiosonic
B. Infrasonic
C. Ultrasonic
D. Supersonic
Sounds with frequencies below 20 hertz are called infrasound. Infrasound is too low-pitched for humans to hear. Sounds with frequencies above 20,000 hertz are called ultrasound.
A. Audiosonic
B. Infrasonic
C. Ultrasonic
D. Supersonic
Sounds with frequencies below 20 hertz are called infrasound. Infrasound is too low-pitched for humans to hear. Sounds with frequencies above 20,000 hertz are called ultrasound.