What frequency range can be heard by the normal human ear referred to as?

The frequency range that can be heard by the normal human ear is referred to as Audio Frequency (AF). This range typically spans from approximately 20 Hz to 20,000 Hz (20 kHz). Sounds within this range include those produced by musical instruments, human speech, and environmental noises, making it crucial for communication and auditory experiences in daily life.

The term Audio Frequency distinguishes it from lower frequencies, such as subsonic frequencies, which are below the audible range and cannot be detected by the human ear. Additionally, high-frequency bands refer to frequencies that are near or above the upper limit of human hearing, while the infrared bandwidth pertains to wavelengths that are not within the acoustic range but rather relate to electromagnetic radiation. Therefore, Audio Frequency accurately captures the complete spectrum of sounds that humans can perceive audibly.