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← ScienceWhich mechanism reduces signal clarity when electromagnetic waves propagate?
A)Atmospheric microwave water absorption✓
B)Ionospheric magnetic field bending
C)Tropospheric radio focusing blockage
D)Stratospheric air current amplification
💡 Explanation
Atmospheric water absorbs microwave energy via dielectric loss, a process where polar water molecules rotate under the electromagnetic field, converting wave energy to heat, because rotational excitation dissipates signal strength; therefore, absorption causes losses, rather than alternative ionospheric or stratospheric effects.
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