The frequency response curve of an RC coupled | vedclass

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(B) The bandwidth is defined as the frequency range in which the amplifier gain remains above $\frac{1}{\sqrt{2}} \approx 0.707$ of the mid-frequency

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$f_4 - f_1$

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(B) The bandwidth is defined as the frequency range in which the amplifier gain remains above $\frac{1}{\sqrt{2}} \approx 0.707$ of the mid-frequency gain $(A_{max})$.The low frequency $f_1$ at which the gain falls to $0.707$ times its mid-frequency value is called the lower cut-off frequency.The high frequency $f_4$ at which the gain falls to $0.707$ times its mid-frequency value is known as the higher cut-off frequency.Therefore,the bandwidth is given by the difference between the higher cut-off frequency and the lower cut-off frequency: $	ext{Bandwidth} = f_4 - f_1$.

The frequency response curve of an $RC$ coupled amplifier is shown in the figure. The bandwidth of the amplifier will be

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