A) \[\tilde{\ }1.2\times {{10}^{12}}{{m}^{-3}}\]
B) \[\tilde{\ }{{10}^{6}}{{m}^{-3}}\]
C) \[\tilde{\ }{{10}^{14}}{{m}^{-3}}\]
D) \[\tilde{\ }{{10}^{22}}{{m}^{-3}}\]
Correct Answer: A
Solution :
If maximum electron density of the ionosphere is \[{{N}_{\max }}\]per \[{{m}^{3}}\]then the critical frequency \[{{f}_{c}}\] is given by \[{{f}_{c}}=9{{({{N}_{\max }})}^{1/2}}\] \[\Rightarrow 10\times {{10}^{6}}=9{{(N)}^{1/2}}\Rightarrow N=1.2\times {{10}^{12}}{{m}^{-3}}\]
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