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Which mechanism explains signal degradation when radio waves propagate across long distances?

A)Atmospheric absorption of wave energy
B)Antenna impedance mismatch causing reflection
C)Signal clipping due to amplifier saturation
D)Frequency drift from local oscillator instability

💡 Explanation

As radio waves propagate, atmospheric absorption occurs because atmospheric gases like water vapor and oxygen absorb the wave's energy, causing it to attenuate over distance. Therefore, atmospheric absorption results in signal degradation, rather than reflection, clipping, or drift which require different system impairments.

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