1.

For sky wave propagation of a `10 MHz` signal, what should be the minimum electron density in ionosphere?A. `1-2xx10^(8)m^(-3)`B. `1-2xx10^(12)m^(-3)`C. `1-2xx10^(14)m^(-3)`D. `1-2xx10^(16)m^(-3)`

Answer» As, `v_(c)=9(N_("max"))^(1//2)`
or `N_("max")=((v_(c))/(9))^(2)=(v_(c)^(2))/(81) =((10xx10^(6))^(2))/(81)`
`=1.2xx10^(12)m^(-3)`


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