12th Class Physics Sample Paper Physics Sample Paper-3

  • question_answer Two waves A and B of frequencies 2 MHz and 3 MHz, respectively are beamed in the same direction for communication via sky wave. Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?

    Answer:

    As the frequency of wave B is more than that of wave A, it means that, the refractive index of wave B is also more than that of A. Therefore, for higher frequency wave, angle of refraction is less, i.e. bending is less. So, wave B travel longer distance in ionosphere before suffering TIR.


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