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 :
[a] The critical frequency of a sky wave for reflection from a layer of atmosphere is given by \[{{f}_{c}}=9{{({{N}_{\max }})}^{1/2}}\]\[\Rightarrow \]\[10\times {{10}^{6}}=9{{({{N}_{\max }})}^{1/2}}\]\[\Rightarrow \]\[{{N}_{\max }}{{\left( \frac{10\times {{10}^{6}}}{6} \right)}^{2}}=1.2\times {{10}^{12}}{{m}^{2}}\]
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