The minimum audible frequency for human ears is
A. 20 Hz
B. 100 Hz
C. 700 Hz
D. 1 Hz

Hint: The human ears has a vast range and sensitivity. It provides us information about the sound like how loud the sound is, its pitch and direction.

Complete answer:
Hearing is the awareness through our senses and the hearing of the human mainly depends on the loudness of the sound and pitch of the sound. Pitch is a sensation that helps us to differentiate between the low note and high note of the sound whereas the loudness is the amount of energy crossed units are at a point per second. Both the loudness and pitch of the sound depends on several factors like surface of medium, air, Doppler Effect, etc.
For a human being with standard hearing, the audible frequency of the human hearing starts low at around 20 Hz and the maximum possible audible frequency without causing any discomfort is around 20, 000 Hz.

So, the correct answer is “Option A”.

Additional Information:
The loudness of the sound depends upon intensity of the sound, surface area of the surrounding body, direction and speed of the air, density of the medium, distance between the source and observer.
The pitch of the sound depends upon the Doppler Effect.

Note:
The range within which the sound of the human being can hear any sound is termed as audible range of frequency.
The range of the audible frequency of the human hearing is 20 Hz to 20,000 Hz; however, the hearing of the human being is most sensitive between 2000 Hz and 5000 Hz range of frequency.