UPPSC 2013 General Studies I Solved Paper

(c) Wireless communication is reflected to earth‘s surface by Ionosphere. Ionosphere is the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies about 75-1000 km(46-621 miles) above the Earth. In the Ionosphere, ions (charged particles) are present which help in reflecting the waves back to the Earth, thus help in transmitting signals to the Earth.