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  1. A radio wave is incident on a layer of ionosphere at an angle of 30° with the vertical. If the critical frequency is, 1.2 MHz, the maximum usable frequency is

    2. A.
    1.2 MHz
    B.
    2.4 MHz
    C.
    0.6 MHz
    D.
    1.386 MHz

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    Answer : Option D

    Explanation :

    fmuf = for sec i = 1.2 x 106 x sec (30°) = 1.386 MHz.

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