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JEE Main & Advanced JEE Main Paper (Held On 22 April 2013)

  • question_answer
    This question has Statement-1 and Statement-2. Of four choices given after the Statements, choose the one that best describes the two Statements.                 Statement 1: Short wave transmission is achieved due to the total internal reflection of the e-m wave from an appropriate height in the ionosphere.                 Statement 2: Refractive index of a plasma is independent of the frequency of e-m waves.     JEE Main  Online Paper (Held On 22 April 2013)

    A)  Statement 1 is true, Statement 2 is false

    B)  Statement 1 is false, Statement 2 is true

    C)  Statement 1 is true, Statement 2 is true but Statement 2 is not the correct explanation of Statement 1

    D)  Statement 1 is true, Statement 2 is true but Statement 2 is the correct explanation of Statement 1

    Correct Answer: A

    Solution :

     Effective refractive index of the ionosphere \[{{n}_{eff}}={{n}_{0}}{{\left[ 1-\frac{80.5N}{{{f}^{2}}} \right]}^{1/2}}\] where f is the frequency of cm waves


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