1.Previous
3.Next

scale accommodates the vast range of sound heard by the human ear. Frequency, or pitch, is measured in hertz (Hz) and reflects the number of sound waves propagated through the air per second. Humans generally hear frequencies from 20 Hz to 20,000 Hz; however, sensitivity to hearing higher frequencies decreases with age. Some organisms, such as elephants, can register frequencies between 0 and 20 Hz (infrasound), and others, such as bats, can recognize frequencies above 20,000 Hz (ultrasound)

1.Previous
3.Next