A) Ground wave signals are more stable than the sky wave signals.
B) The critical frequency of an ionosphere layer is the highest frequency that will be reflected back by the layer when it is vertically incident.
C) Electromagnetic waves of frequencies higher than about 30 MHz cannot penetrate the ionosphere.
D) Sky wave singles in the broadcast frequency range are stronger at night than in the day time.
Correct Answer: C
Solution :
[c] Above critical frequency
an electromagnetic wave penetrates the ionosphere and is not reflected by it.
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