Radio Navigationmedium#1190
The D layer of the ionosphere primarily:
A
Absorbs LF and MF radio waves during the day
CorrectB
Reflects HF radio waves
C
Has no effect on radio waves
D
Reflects VHF signals
Explanation
The D layer (60-90 km altitude) absorbs lower frequency radio waves during daytime. It disappears at night, which is why NDB night effect occurs.
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