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← ScienceWhich outcome occurs when a waveguide operating below cutoff?
A)Evanescent wave propagation becomes dominant✓
B)Reflected power exhibits total transmission
C)Group velocity matches phase velocity
D)Maximum energy transfer achieved immediately
💡 Explanation
Below cutoff, the waveguide acts like a reactive impedance, because attenuation causes rapid decay via evanescent wave propagation rather than sustained signal transmission; therefore, the wave amplitude diminishes exponentially, rather than propagating as the intended mode.
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