Which term describes sound within the range audible to humans (roughly 20 Hz to 20 kHz)?

Which term describes sound within the range audible to humans (roughly 20 Hz to 20 kHz)?

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

Answer: (B)

Sound that humans can hear falls in the audible range, roughly from 20 Hz to 20 kHz. This is the range where pitches and loudness are perceivable, so the label “audible sound” is the correct choice. Infrasound refers to frequencies below 20 Hz and is not audible. Ultrasound is above 20 kHz and also cannot be heard. Subsonic isn’t the standard term for a frequency range of sound like this; it’s more often used to describe speeds relative to the speed of sound, not the audible category.

Sound that humans can hear falls in the audible range, roughly from 20 Hz to 20 kHz. This is the range where pitches and loudness are perceivable, so the label “audible sound” is the correct choice.

Infrasound refers to frequencies below 20 Hz and is not audible. Ultrasound is above 20 kHz and also cannot be heard. Subsonic isn’t the standard term for a frequency range of sound like this; it’s more often used to describe speeds relative to the speed of sound, not the audible category.