1.

For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere [AFMC 2005]

A.            \[\tilde{\ }1.2\times {{10}^{12}}{{m}^{-3}}\]              
B.            \[\tilde{\ }{{10}^{6}}{{m}^{-3}}\]
C.            \[\tilde{\ }{{10}^{14}}{{m}^{-3}}\]                                  
D.            \[\tilde{\ }{{10}^{22}}{{m}^{-3}}\]
Answer» B.            \[\tilde{\ }{{10}^{6}}{{m}^{-3}}\]


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