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← ScienceWhich outcome arises when a pulsed microwave source exceeds a waveguide's mode volume?
A)Increased dielectric material electron mobility
B)Waveguide impedance matching enhancement
C)Internal arc discharge and breakdown✓
D)Reduced resistive losses along waveguide
💡 Explanation
Arc discharge arises because exceeding mode volume increases the electric field beyond the dielectric's strength initiating avalanche ionization; therefore, breakdown occurs, rather than impedance matching which mitigates reflected power at specified frequencies.
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