Ultrasonic sound refers to sound waves that have frequencies higher than the upper limit of human hearing, which is typically around 20,000 hertz (Hz). Inaudible sound can include both ultrasonic and infrasonic frequencies, meaning sound waves below the lower limit of human hearing.
High-amplitude ultrasonic sound, just like high-amplitude audible sound, can potentially be harmful to the human ear. The potential harm depends on factors such as the frequency, duration, and intensity of the sound exposure.
At very high amplitudes, ultrasonic sound can cause physical damage to the delicate structures of the ear, including the eardrum and the hair cells within the inner ear. Prolonged exposure to high-intensity ultrasonic sound can lead to temporary or permanent hearing loss, as well as other auditory issues.
It's worth noting that the human ear has natural protection against some ultrasonic frequencies. The outer ear, particularly the shape and structure of the ear canal, can provide some degree of natural attenuation for high-frequency sounds. However, this natural protection is limited, and prolonged exposure to intense ultrasonic sound can still be damaging.
If you are exposed to high-amplitude or prolonged ultrasonic sound and experience any discomfort, pain, or changes in hearing, it is recommended to seek medical attention. It's important to handle ultrasonic devices with caution and ensure that exposure to high-intensity ultrasonic sound is minimized to protect your hearing health.