<prompt> Normal hearing:20-20,000 hz30 - 30,000 hz200-2000 hz300 - 3000 hz  <response>: Ans. a 20 - 20,000lizRef: Dhingrays ENT 6th ed.14-15 Normal hearing capacity is from 20 Hz to 20,000 Hz. Function of hearing is by cochlea, which has 2 ends broadly. Apex and Base. Apex is for low frequency sound 20 Hz and Base is for high frequency sound 20,000 Hz. 