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Which mechanism causes increased radio signal attenuation during heavy rainfall?

A)Molecular absorption by water
B)Refraction due to thermal gradients
C)Diffraction around large droplets
D)Destructive interference from reflections

💡 Explanation

During rainfall, increased attenuation happens as water molecules absorb electromagnetic energy from the radio waves because the oscillating electric field excites water molecules, converting kinetic energy, leading to signal loss. Therefore molecular absorption results, rather than refraction, diffraction, or interference, requiring different atmospheric conditions.

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