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## Homework Statement

http://img832.imageshack.us/img832/7517/captureax.jpg [Broken]

According to the solution, the cutoff frequencies are 1, 20, 80, 500 and 8000. I don't understand how to get those answers by inspecting the plot.

## Homework Equations

None

## The Attempt at a Solution

I think the cutoff frequency is defined as the frequency at which the ratio of input/output equals to 0.707, or whenever the magnitude of the frequency breaks downward. However, I don't see why 1, 20, 80, 500 and 8000 are the cutoff frequency for this bode plot. So how exactly can I tell what the cutoff frequencies are by inspecting the plot? Thank you so much.

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