The frequency response curve of $R C$ coupled amplifier is shown in figure. The band width of the amplifier will be
A(a) $f_3-f_2$
B(b) ${ }_3 f_4^4-f_1$
C(c) $\frac{f_4-f_2}{2}$
D(d) $f_3-f_1$
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B(b) ${ }_3 f_4^4-f_1$
(b) The band width is defined as the frequency band in which the amplifier gain remains above $\frac{1}{\sqrt{2}}=0.707$ of the mid frequency gain $(A)$. The low frequency $f$ at which the gain falls to $\frac{1}{\sqrt{2}}$ i.e. 0-.707 times it's mid frequency value is called lower cut off frequency and the high frequency $f$ at which the gain falls to $\frac{1}{\sqrt{2}}$ i.e. 0.707 times of it's mid frequency is known as higher cut off frequency so band width $=f-f$.
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