Decade (log scale)
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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 in graphical form, such as in Bode plots, since depicting frequencies on a linear scale is not practical. For example, an audio amplifier will usually have a frequency band ranging 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 1 Hz (100) and go up to perhaps 100 kHz (105), to comfortably include the full audio band in a standard-sized graph paper, as shown below:
100.....101.....102.....103.....104.....105
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