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GS Geography Physical Geography of World
Q.

Which of the following layers of the atmosphere makes Radio Communication possible?
Explanation:

ANS. (C) 
The ionosphere is a region of the upper atmosphere where there are large concentrations of free ions and electrons. While the ions give the ionosphere its name, but it is the free electrons that affect the radio waves and radio communications. In particular, the ionosphere is widely known for affecting signals on the short wave radio bands where it reflects signals enabling these radio communications signals to be heard over vast distances.

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