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Which of the following layer is used mostly for the long distance communication?

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Which of the following layer is used mostly for the long distance communication?

(a) Troposphere

(b) Stratosphere

(c) Ionosphere

(d) D layer during night hours

I had been asked this question during an interview.

Asked question is from Radio Wave Propagation in chapter Radio Wave Propagation of Antennas

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Correct answer is (c) Ionosphere

To explain: Ionosphere is most widely used for long distance communication and it lies at 90 to 400km from earth surface. D layer is not present at night hours.

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