1.

The frequency of a wave propagating in D-region having refractive index of 0.5 isA. ` 420 kcs^(-1) `B. ` 300 kcs^(-1) `C. `329.5 kcs ^(-1)`D. `350 kcs^(-1)`

Answer» Correct Answer - C
Electron density of D-region is ` 10^(-3)`
` mu=1-(81.45 N)/( v^(2))`
Given refractive index ,` mu =0.5 `
` implies 0.5 sqrt(1-(81.45xx 10^(9))/(v^(2)))`
` implies v=329.5 kcs^(-1)`


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