Hearing
The absolute threshold of hearing is the minimum sound level of a pure tone that an average ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the organism.
The threshold of hearing is generally reported as the RMS sound pressure of 20 µPa (micropascals) = 2×10−5 pascal (Pa). It is approximately the quietest sound a young human with undamaged hearing can detect at 1,000 Hz. The threshold of hearing is frequency dependent and it has been shown that the ear's sensitivity is best at frequencies between 1 kHz and 5 kHz.
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Famous quotes containing the word hearing:
“A fearful man is always hearing things.”
—Sophocles (497–406/5 B.C.)
“That myth—that image of the madonna-mother—has disabled us from knowing that, just as men are more than fathers, women are more than mothers. It has kept us from hearing their voices when they try to tell us their aspirations . . . kept us from believing that they share with men the desire for achievement, mastery, competence—the desire to do something for themselves.”
—Lillian Breslow Rubin (20th century)
“The hearing ear is always found close to the speaking tongue; and no genius can long or often utter anything which is not invited and gladly entertained by men around him.”
—Ralph Waldo Emerson (1803–1882)