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Physics · L5 · Wave Propagation vs Reflection in a Plasma

How an electromagnetic wave's frequency relative to the plasma frequency determines whether it propagates or reflects.

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📡 EM wave of frequency ωincident on plasmaω vs plasma frequency ω_p?ε(ω) = 1 − ω_p²/ω² < 0wavevector imaginaryWave reflected /evanescent (no propagation)ε(ω) > 0,wavevector realWave propagatesthrough the plasmaω < ω_pω > ω_p

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