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  1. In radio-communication, the signals emitted by transmitting antenna are reflected on

  2. A.

     Stratosphere

    B.

     Ozonosphere

    C.

     Ionosphere

    D.

     Troposphere

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    Answer : Option C

    Explanation :

    The lower atmosphere is more or less transparent to radio waves. However, the ionosphere reflects back the radio waves. Thus, a signal emitted by an antenna from a certain place can be received at another place on the surface of Earth in the following two ways: ground wave propagation and sky wave propagation.


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