Which term describes sound with frequencies above human hearing?

Which term describes sound with frequencies above human hearing?

• A. Infrasound
• B. Audible sound
• C. Ultrasound
• D. Subsonic

Answer: (C)

Sound above human hearing is described as ultrasound. Human hearing ranges roughly from 20 Hz to 20 kHz, so anything higher than that is considered ultrasonic. The term ultrasound uses the prefix ultra-, meaning beyond, and it’s the standard label for these high-frequency waves used in medical imaging and therapy. Because higher frequencies have shorter wavelengths, they can create finer detail in images, though they don’t penetrate as deeply and attenuate more quickly. Infrasound refers to sounds below the audible range (below about 20 Hz), which is why it isn’t the right term here. Audible sound is everything within the range humans can hear, and subsonic is not the precise label for sounds above hearing in this context.

Sound above human hearing is described as ultrasound. Human hearing ranges roughly from 20 Hz to 20 kHz, so anything higher than that is considered ultrasonic. The term ultrasound uses the prefix ultra-, meaning beyond, and it’s the standard label for these high-frequency waves used in medical imaging and therapy. Because higher frequencies have shorter wavelengths, they can create finer detail in images, though they don’t penetrate as deeply and attenuate more quickly.

Infrasound refers to sounds below the audible range (below about 20 Hz), which is why it isn’t the right term here. Audible sound is everything within the range humans can hear, and subsonic is not the precise label for sounds above hearing in this context.