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The value of frequency at which electrom...

The value of frequency at which electromagnetic wave has been propagated through the D-region of atmosphere is `3.27 xx 10^5 Hz`. The electron density for D-region is 400 electrons/cc. What is the refractive index of D-region of atmosphere?

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Here, `v = 3.27 xx 10^5 Hz, mu_r = ?`
`N = 400` electrons/cc `= 400 xx 10^6 "electrons"//m^2`
`4 xx 10^(8) "electroms"//m^3`
As `mu_r = sqrt(1-(81.45 xxN)/v^2)`
`= sqrt(1 - (81.45 xx 4 xx 10^8)/(3.27 xx 10^5)^2)`
`= sqrt(1-0.3) = sqrt(0.7)`
` = 0.837`.
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