f1 is the lower half power frequency of a single stage amplifier. The lower half power frequency of n-stage amplifier is ______.
1
\(f_1 \sqrt{2^{\frac{1}{n}}-1}\)
2
\(\dfrac{f_1}{\sqrt{1-2^{\frac{1}{n}}}}\)
3
\(f_1 \sqrt{1-2^{\frac{1}{n}}}\)
4
\(\dfrac{f_1}{\sqrt{2^{\frac{1}{n}}-1}}\)
5
Question Not Attempted