An inverting amplifier has a closed-loop voltage gain of -25 . The op-amp used has a low-frequency, open-loop gain of \(2 \times 10^{4}\) and has a unity-gain bandwidth of \(10^{6} \mathrm{~Hz}\).

(a) What is the \(3 \mathrm{~dB}\) frequency \(f_{3 \text {-dB }}\) of the op-amp and the \(3 \mathrm{~dB}\) frequency \(f_{3-\mathrm{dB}}\) of the closed-loop amplifier?

(b) Using the results of part (a), what is the magnitude of the voltage gain for the open-loop and closed-loop amplifiers at \(f=0.25 f_{3-\mathrm{dB}}\) and at \(f=5 f_{3-\mathrm{dB}}\) ?