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← ScienceWhich phenomenon limits signal propagation distance wireless communication?
A)Atmospheric absorption of electromagnetic energy✓
B)Refraction index variation air moisture
C)Diffraction due to ionospheric polarization
D)Increased antenna impedance near ground
💡 Explanation
Atmospheric absorption increases with frequency; the electromagnetic energy dissipation causes signal power decline, thus shrinking the propagation range, because radiant power is converted to heat rather than reflected by atmospheric scattering. Therefore, radio waves attenuate rather than maintain a strong signal across long distances.
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