i) The frequency of audible sound is A) 20 Hz to 2000 Hz B) Less than 20 Hz C) Less than 200 Hz D) More than 20000 Hz
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Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. (Human infants can actually hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature; the upper limit in average adults is often closer to 15–17 kHz.)
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