34.What are infrasonic sounds? [A] Sounds of frequencies below 20 Hz [B] Sounds of frequencies above 20 Hz [C] Sounds of frequencies below 200 Hz [D] Sounds of frequencies above 20 Hz Show Answer
Infrasound, sometimes referred to as low status sound, describes sound waves with a frequency below the lower limit of human audibility. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high...
