Question

what is the type of sound that is too deep from humans to hear?
subsonic
ultrasound
infra - sound
supersonic
rewatch

Explanation:

Infrasound (also called infra - sound) refers to sound waves with a frequency lower than 20 Hz. The human ear can typically perceive sound frequencies in the range of 20 Hz to 20,000 Hz. So, infrasound has a frequency that is too low (too "deep" in terms of frequency - lower frequencies are often described as deeper - for human hearing), and thus humans cannot hear it. Subsonic and supersonic are terms related to the speed of an object relative to the speed of sound, not the frequency of sound for hearing. Ultrasound has a frequency higher than 20,000 Hz, which is too high (not too deep) for human hearing.

Answer:

C. Infra - sound