Question

What is the range of hearing of human beings? Around which frequency of sound are our ears most sensitive?

Answer 1

1. The human auditory system is sensitive to frequencies from about $20Hz$ to a maximum of around $20,000Hz$, although the upper hearing limit decreases with age.
2. Within this range, the human ear is most sensitive between $2000Hz$ and $5000Hz$, largely due to the resonance of the ear canal and the transfer function of the ossicles of the middle ear.
3. The high sensitivity region at $2000-5000Hz$ is very important for the understanding of speech.