(a) The open-loop low-frequency voltage gain of an amplifier is \(A_{v}=\) \(5 \times 10^{4}\) and the open-loop \(3 \mathrm{~dB}\) frequency is \(f_{H}=10 \mathrm{~Hz}\). If the closed-loop low-frequency gain is \(A_{v f}=25\), what is the closed-loop bandwidth?

(b) The minimum closed-loop bandwidth of a feedback amplifier is to be \(20 \mathrm{kHz}\). The open-loop low-frequency voltage gain is \(A_{v}=10^{5}\) and the open-loop \(3 \mathrm{~dB}\) frequency is \(f_{H}=8 \mathrm{~Hz}\). What is the maximum closed-loop voltage gain?