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← ScienceWhich consequence results when a waveguide supports multiple modes?
A)Modal dispersion limits signal bandwidth✓
B)Impedance matching becomes unconditionally perfect
C)Dielectric breakdown threshold sharply increases
D)Cutoff frequency increases significantly
💡 Explanation
Modal dispersion limits signal bandwidth because multiple modes travel at different speeds in the waveguide. This causes pulse spreading, therefore bandwidth is limited, rather than impedance improving or dielectric strength changing whose effects are orthogonal.
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