1.

The frequency of a wave propagating in D-region having refractive index of 0.5 isA. `420` kc/s .B. 300 kc/s.C. `207.33` kc/s.D. none of these

Answer» Correct Answer - C
Electron density of D-region is `10^(9) m^(-3)`
` mu = sqrt(1-(81.45N)/v^(2))`
` 0.5 = sqrt(1-(81.45xx10^(9))/v^(2))`
` :. v = 207 .33 kc//s`


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