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In short wave communication, waves of which of the following frequencies will be reflected back by the ionoshperic layer having electron density `10^11 " per " m^3`A. 2 MHzB. 10 MHzC. 12MHzD. 18 MHz |
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Answer» Correct Answer - A Critical frequency `f_c=9(N_"max")^(1//2)` where `N_"max"`=Electron density `therefore f_c=9(10^11)^(1//2) = 9(1/10xx10^12)^(1//2)` `=9/sqrt10xx10^6=2.8xx10^6` Hz = 2.8 MHz `therefore ` The frequency of 2 MHz which is less than the critical frequency will be reflected. |
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