A) \[\sim 1.2\times {{10}^{12}}{{m}^{-3}}\]
B) \[\sim {{10}^{6}}{{m}^{-3}}\]
C) \[\sim {{10}^{14}}{{m}^{-3}}\]
D) \[\sim {{10}^{22}}{{m}^{-3}}\]
Correct Answer: A
Solution :
The critical frequency of sky wave undergoing reflection from a layer of ionosphere is \[{{f}_{c}}=9\sqrt{{{N}_{\max }}}\] where N is electron density per \[{{m}^{3}}.\] \[{{N}_{\max }}=\frac{{{f}_{c}}^{2}}{81}=\frac{{{(10\times {{10}^{6}})}^{2}}}{81}=1.2\times {{10}^{12}}\,{{m}^{-3}}\]
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