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← ScienceWhich consequence results when the driving frequency approaches plasma frequency?
A)Wave impedance nears zero
B)Refractive index approaches unity
C)Wave propagation becomes evanescent✓
D)Magnetic field reaches maximum intensity
💡 Explanation
Wave energy absorbed leads to cutoff, because the driving frequency excites plasma oscillations causing a complex refractive index; propagation becomes evanescent, therefore, rather than propagating energy flow because index matching does not occur.
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