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← ScienceWhich consequence results when a waveguide's dimensions narrow?
A)Cutoff frequency increases significantly✓
B)Wave impedance remains unchanged
C)Group velocity linearly decreases
D)Phase velocity becomes propagation-invariant
💡 Explanation
As waveguide dimensions narrow, the cutoff frequency increases due to the inverse relationship between waveguide size and minimum frequency for wave propagation described by waveguide dispersion; therefore a higher frequency is required, rather than maintaining impedance because the mode changes.
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