The human ear can respond to a range of frequencies from about ____________.

The human ear can respond to a range of frequencies from about 20 to 20,000 Hz. This range is crucial for normal hearing and encompasses the frequencies typically used in speech and a wide variety of environmental sounds. The lower limit of 20 Hz corresponds to the lowest frequency that the average human ear can perceive, while the upper limit of 20,000 Hz represents the highest frequency that can typically be detected, particularly in younger individuals. As people age, this upper limit often decreases due to factors like natural auditory decline.

This frequency range is significant because it highlights the auditory capabilities necessary for effective communication and interaction with the environment. A different range of frequencies or decibels would not accurately represent the sensitivity of human hearing across its full spectrum. Other options provided either refer to incorrect units, such as dB SPL (decibels Sound Pressure Level), which measure sound intensity rather than frequency, or do not adequately capture the capabilities of the human auditory system.