Discussion
Why is a frequency response plotted on logarithmic axes?
Answer: B
A single pole falls at a constant number of decibels per octave, so on logarithmic axes it becomes a straight line and the whole response can be sketched from its break points and slopes alone. Phase is plotted separately either way, linear axes can represent any number, and gain is meaningful in any units. A coordinate system that turns the behaviour of interest into straight lines is worth adopting for that reason by itself, and it is why Bode's construction survived the arrival of computers.
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