Which outcome occurs when a high-frequency electromagnetic wave propagates through a metal waveguide below its cutoff frequency?

💡 Explanation

When a wave propagates below the cutoff frequency, only evanescent modes can exist because wavevector becomes imaginary, leading to exponential attenuation of the field. Therefore, wave attenuation results, rather than amplification, polarization shift, or refractive index change, all requiring different propagation conditions and materials.

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