A) ~ 1.2 ´ 1012 m?3
B) ~ 106 m?3
C) ~ 1014 m?3
D) ~ 1022 m?3
Correct Answer: A
Solution :
The critical frequency of a sky wave for reflection from a layer of atmosphere is given by \[{{f}_{c}}=9{{({{N}_{\max }})}^{1/2}}\] Þ \[10\times {{10}^{6}}=9{{({{N}_{\max }})}^{1/2}}\] Þ \[{{N}_{\max }}={{\left( \frac{10\times {{10}^{6}}}{9} \right)}^{2}}\tilde{}1.2\times {{10}^{12}}{{m}^{-3}}\]
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