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Which failure ensues when a high-power microwave amplifier operates above its designed frequency, while utilizing a resonant cavity?

A)Excessive RF feedback oscillation
B)Reduced electromagnetic mode separation
C)Increased thermal electron collisions
D)Destructive dielectric breakdown occurs

💡 Explanation

A higher frequency causes electromagnetic mode separation to degrade because the cavity dimensions become less optimal for the intended mode; therefore, mode competition increases and efficiency drops rather than causing oscillations or breakdown alone under ideal operating voltages.

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