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Which 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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