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Which outcome results when plasma reflects pulsed microwaves in waveguides?

A)Ionisation generates increased cut-off frequency
B)Decreased waveguide impedance matching occurs
C)Waveguide wall resonant mode forms
D)Higher order mode conversion stabilizes

💡 Explanation

Increased cut-off frequency happens because the increased electron density in the plasma allows **plasma frequency resonance effect**. The microwaves are reflected rather than propogating within the waveguide because the plasma frequency exceeds wave frequency.

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