Problem 5.206

A sounding of dilute plasma by radiowaves of various frequencies reveals that radiowaves with wavelengths exceeding \(\lambda_{0}=0.75 \mathrm{~m}\) experience total internal reflection. Find the free electron concentration in that plasma.

n_{0}=4 \pi^{2} \varepsilon_{0} m c^{2} / e^{2} \lambda_{0}^{2}=2.0 \cdot 10^{9} \mathrm{~cm}^{-3}

Dispersion and Absorption of Light