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← ScienceWhich 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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