The frequency response curve of RC coupled amplifier is shown in figure. The band with of the amplifier will be

f_{3} - f_{2}

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f_{4} - f_{1}

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\frac{f_{4} - f_{2}}{2}

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f_{3} - f_{1}

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Solution

The correct option is B $f_{4} - f_{1}$
Bandwidth is taken as the range of frequencies for which the power P is greater than or equal to half the maximum value i.e. the frequencies over which $P > P_{m a x}$ .
We know that $P \propto A^{2}$
Band width can now be defined as the range of frequencies for which the amplitude $A$ is greater than or equal to the maximum value.
In the above graph it can be seen that at $f_{4}$ and $f_{1}$ , the amplitude is $\sqrt{2} A_{m a x}$ . Hence bandwidth will be, $f_{4} - f_{1}$ .

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