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Question

There are a variety of sounds in our environment, ranging from faint sounds like birdsong, ticking clock and rustling leaves to louder sounds like music, yelling, and industrial noise.
Why don’t we get to hear all the sound around us?

A
Humans can’t hear sound below 1 KHz
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B
Humans can’t hear sound above 5 KHz
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C
Humans can hear sounds best from 20 Hz to 20 KHz
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D
Humans can only hear sounds above 5 KHz
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Solution

The correct option is C Humans can hear sounds best from 20 Hz to 20 KHz
Each and every sound has its own frequency. Humans can hear sounds at frequencies ranging from 20 Hz to 20,000 Hz, but our hearing cells in the ear are most sensitive in the 2000 - 5000 Hz frequency range., where human speech is centered.
Establishing the effect of sounds with frequencies under about 250 Hz is very hard for human brain. Even though they’re above the lower limit of 20 Hz, these low-frequency sounds tend to be either inaudible or barely audible, and people don’t always know when they’re exposed to them. Same happens with the high frequency range.

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