In the context of Bode magnitude plots, 40 dB/decade is the same as

For a unity feedback control system with the forward path transfer function G(s)=K/s(s+2). The peak resonant magnitude Mr of the closed-loop frequency response...

In the feedback system shown below G(s)=1/((s+1)(s+2)(s+3)). The positive value of k for which the gain margin of the loop is exactly 0 dB and the phase mar...