Question

The audible range of a normal human being is:
A. 10Hz to 20,000Hz
B. 20Hz to 20KHz
C. 10Hz to 50KHz
D. 20Hz to 1000Hz

Answer 1

The audible range describes the range of frequencies that can be heard by humans or other animals. A basic measure of hearing is done by an audiogram which is a graph of the absolute threshold of hearing (i.e., minimum discernible sound level) at various frequencies throughout an organism's nominal hearing range.

Complete Answer:
The human auditory field is a band of specific frequencies and intensities which are perceived by our ear. Acoustic vibrations outside of this specific field are not considered as "sounds" even if they can be perceived by other animals.
Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. Human infants, however, can hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature. The upper limit in average adults is often closer to 15–17 kHz. All sounds below 20 Hz are classified as infrasound, although some animals (for example, mole-rat, or elephant) can hear them. Similarly, all sounds above 20 kHz are termed as ultrasounds, but they can be heard by a cat or a dog (up to 40 kHz) or a dolphin or a bat (up to 160 kHz).

Note:
Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, even though the threshold increases sharply at 15 kHz in adults. This occurs in accordance with the last auditory channel of the cochlea. The human auditory system is most sensitive in the frequency range of 2,000 to 5,000 Hz. Individual hearing range, however, varies according to the general condition of a human's ears and nervous system.