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← ScienceWhich constraint rapidly limits millimeter wave signal range?
A)Rainfall's signal absorption increases exponentially✓
B)Antenna impedance mismatch creates noise
C)Atmospheric pressure causes wave deceleration
D)Signal bandwidth overwhelms channel capacity
💡 Explanation
Severe signal attenuation occurs because **molecular absorption** causes millimeter waves to lose energy when interacting with water molecules in rain; therefore range decreases, rather than impedance mismatch or bandwidth issues, which are less directly impactful under normal rain conditions.
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