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At what distance the sky wave propagation is present from the earth surface?

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At what distance the sky wave propagation is present from the earth surface?

(a) 50 to 400km

(b) Below 50 km

(c) 600 to 750km

(d) 50 to 400 m

The question was posed to me in an international level competition.

Question is from Radio Wave Propagation topic in chapter Radio Wave Propagation of Antennas

1 Answer

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The correct choice is (a) 50 to 400km

For explanation: Sky wave propagation also known as ionosphere propagation reflects the waves with frequency 2 to 30MHz. It is present at 50 to 400km from earth surface.

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