Hearing range usually describes the range of frequencies that can - TopicsExpress

Hearing range usually describes the range of frequencies that can be heard by humans or other animals, though it can also refer to the range of levels. The human range is commonly given as 20 to 20,000 Hz, though there is considerable variation between individuals, especially at high frequencies, and a gradual decline with age is considered normal. Sensitivity also varies with frequency, as shown by equal-loudness contours. Routine investigation for hearing loss usually involves an audiogram which shows threshold levels relative to a standardized norm. Several animal species are able to hear frequencies well beyond the human range. Some dolphins and bats, for example, can hear frequencies in excess of 100 kHz.

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