Which mechanism causes increased signal attenuation during long-distance microwave propagation through moist air?

💡 Explanation

When microwaves propagate through moist air, molecular absorption occurs because water vapor molecules have rotational resonances that absorb microwave energy, increasing signal attenuation, especially at certain frequencies. Therefore, molecular absorption by water vapor results, rather than scattering, diffraction or refraction, that depend on different environmental factors and mechanisms.

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