CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2011

  • question_answer
    The distance of coverage of a transmitting antenna is 12.8 km. Then, the height of the antenna is (Given that radius of earth = 6400 km)

    A)  6.4 m                                   

    B)  12.8 m 

    C)  3.2 m                   

    D)  16 m

    E)  25.6 m

    Correct Answer: B

    Solution :

    Given \[d=12.8\text{ }km,\text{ }R=6400\text{ }km\] We have      \[d=\sqrt{2hR}\]                 \[h=\frac{{{d}^{2}}}{2R}\]                 \[=\frac{{{(12.8)}^{2}}}{2\times 6400}=12.8\,m\]


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