How does the human ear respond to frequencies below 20 Hz?
The human ear cannot hear frequencies below 20 Hz
The human ear can detect sound waves only in a limited frequency range, roughly 20 Hz to 20,000 Hz. Sound waves with frequency below 20 Hz are called infrasonic and lie outside this audible range.
Because the ear's structure and its sensory cells are not sensitive to such low frequencies, we simply do not perceive them as sound. The ear does not convert them into higher frequencies, nor does it selectively amplify only high frequencies; it just fails to register infrasonic vibrations.
Hence, the answer is The human ear cannot hear frequencies below 20 Hz.
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