Describe infrasonic and ultrasonic waves and explain why humans can not hear them?

Answer 1

The human ear cannot detect all possible frequencies. It has evolved to detect frequencies of sounds that are the most useful to humans, and has a maximum frequency range of about 20Hz to 20kHz, which decreases as you get older, particularly at the higher end.

Infrasonic describes sounds that are too low in frequency to be heard by the human ear, and ultrasonic describes sounds that are too high in frequency to be heard by the human ear. These sounds cannot be heard by the human ear because they are outside of its range of capability.

Answer 2

Infrasonic waves have frequencies below the range of human hearing (below 20 Hz), while ultrasonic waves have frequencies above the range of human hearing (above 20 kHz). Humans cannot hear them because the structures of the inner ear are not sensitive to these extreme frequencies. Our auditory system is tuned to detect sounds within a specific frequency range that is optimal for our survival and communication needs.