1. What is the audible range of the average human ear?
Answer
$20 Hz$ to $20,000 Hz$. Any sound less than $20 Hz$ or greater than $20,000 Hz$ frequency is not audible to human ears.
2. What is the range of frequencies associated with
(a) Infrasound?
(b) Ultrasound?
Answer
(a) $20 Hz$
(b) $20,000 Hz$
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