Question

the frequency less than _____ Hz is not audible to human ear.​

Answer 1

Human ear perceives frequencies between 20 Hz (lowest pitch) to 20 kHz (highest pitch). All sounds below 20 Hz are qualified as infrasounds, althought some animals.

Answer 2

The frequency range we are comfortable with is 2,000 Hz – 5,000 Hz. Now coming back to our question, the sound that can not be heard by the human ear is 50,000 Hz as it falls beyond the highest end of our frequency range, i.e. 20 Hz to 20,000 Hz.

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