A decade on a graphical logarithmic scale represents multiplication by 10 from the previous value. It is commonly used to represent the frequency response of electronic circuits since depicting frequencies on a linear scale is not practical. For example for an audio amplifier, the frequency band extends from 20 Hz to 20 kHz and representing the entire band using a decade log scale is very convenient. Typically the graph for such a representation would begin at 10 Hz and go upto perhaps 100 kHz as shown below: Value A logarithmic scale is a scale of measurement that gives the logarithm of a physical quantity instead of the quantity itself. ...

10⁰.....10¹.....10².....10³.....10⁴.....10⁵