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Which of the following frequencies will be suitable for beyond the horizon communication using sky waves?

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Which of the following frequencies will be suitable for beyond the horizon communication using sky waves?
A. 10 kHz
B. 10 MHz
C. 1 GHz
D. 1000 GHz
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Correct Answer - B
10kHz , frequencies cannot be radiated due to large antenna size , 1GHz and 1000 GHz will be penetrated .
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