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What should be the ratio of the critical frequencies for reflection or radiowaves from E and `F_1` layers of the ionosphere. If their electrons densities are `2xx10^11//m^3` and `3xx10^11//m^3` respectively ?A. `sqrt(1/2)`B. `sqrt(2/3)`C. `sqrt(3/2)`D. `sqrt(2/5)` |
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Answer» Correct Answer - B Critical Frequency `v_c=9 (N_"max")^(1//2)` `therefore v_c prop (N_"max")^(1//2)` `therefore v_E/v_(F_1) =((2xx10^11)^(1//2))/((3xx10^11)^(1//2)) = (2/3)^(1//2) = sqrt2/3` |
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