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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Communication

  • question_answer
    Maximum useable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70°. Then x is                                                  [Himachal PMT 2003]

    A)            150 MHz                                 

    B)            170 MHz

    C)            175 MHz                                 

    D)            190 MHz

    Correct Answer: C

    Solution :

               \[MUF=\frac{{{f}_{c}}}{\cos \theta }=\frac{60}{\cos 70{}^\circ }=175\,MHz\]


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