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Frequency

Frequency is given as number of vibrations per second and the measuring unit is Hertz (Hz). If vibration occur in air in this range, they affect the ear and the brain as sound.

The human ear can hear vibrations as low as about 20 Hz and as high as about 20,000Hz (20 KHz) and in the mid-range can discriminate sounds as finely as 2 Hz apart. The ability to hear also depends on the amplitude (effectively the loudness) of the vibration. As we get older, the range of frequencies we hear reduces at both ends but more so at the high frequency end.

The originator of the vibrations can be a string, an air column, a stretched membrane, a natural material or electronic. This covers the range of musical instruments.