A) \[1.2\times {{10}^{12}}\text{ }{{m}^{-3}}\]
B) \[{{10}^{6}}\text{ }{{m}^{-3}}\]
C) \[{{10}^{14}}\text{ }{{m}^{-3}}\]
D) \[{{10}^{22}}\text{ }{{m}^{-3}}\]
Correct Answer: A
Solution :
\[{{f}_{c}}=9\sqrt{{{N}_{0}}}\] Where \[{{f}_{c}}\] is the frequency of wave signal, is electron density in Ionosphere \[\frac{{{f}_{c}}}{9}=\sqrt{{{N}_{0}}}\] \[N=\frac{f_{c}^{2}}{81}\]
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