A) \[{{f}_{3}}-{{f}_{2}}\]
B) \[{{f}_{4}}-{{f}_{1}}\]
C) \[\frac{{{f}_{4}}-{{f}_{2}}}{2}\]
D) \[{{f}_{3}}-{{f}_{1}}\]
Correct Answer: B
Solution :
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 (Amax). The low frequency f1 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 f4 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 = f4 ? f1.
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