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Dispersion and Absorption of Light

Problem 5.202

Find the free electron concentration in ionosphere if its refractive index is equal to \(n=0.90\) for radiowaves of frequency \(v=100 \mathrm{MHz}\)

Reveal Answer
n0=(4π2v2mε0/e2)(1−n2)=2.4⋅107 cm−3n_{0}=\left(4 \pi^{2} v^{2} m \varepsilon_{0} / e^{2}\right)\left(1-n^{2}\right)=2.4 \cdot 10^{7} \quad \mathrm{~cm}^{-3}
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