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    Question

    Which layer of the earth’s atmosphere reflects

    back the radio waves to the earth’s surface?
    A Ionosphere Correct Answer Incorrect Answer
    B Stratosphere Correct Answer Incorrect Answer
    C Mesosphere Correct Answer Incorrect Answer
    D Exosphere Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Long distance propagation of radio waves depends on an invisible layer of charged particles, which envelops the Earth. This layer of charged particles known as the ionosphere has been in existence for millions of years. For those, who pioneered the long-distance radio communication during the early part of the twentieth century, the ionosphere came as a boon.

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