Noise figure is defined as
A. $$F = \frac{{\frac{{{S_i}}}{{{N_i}}}}}{{\frac{{{S_0}}}{{{N_0}}}}}$$
B. $$F = \frac{{\frac{{{S_0}}}{{{N_0}}}}}{{\frac{{{S_i}}}{{{N_i}}}}}$$
C. $$F = \frac{{\frac{{{S_0}}}{{{N_0}}}}}{{\sqrt {\frac{{{S_i}}}{{{N_i}}}} }}$$
D. $$F = \frac{{\frac{{{S_i}}}{{{N_i}}}}}{{\sqrt {\frac{{{S_0}}}{{{N_0}}}} }}$$
Answer: Option A
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