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GATE ECE 1996 | Question-38

The critical frequency of an ionospheric layer is $10 \mathrm{MHz}$. What is the maximum launching angle from the horizon for which $20 \mathrm{MHz}$ wave will be reflected by the layer?

  1. $0^{\circ}$
  2. $30^{\circ}$
  3. $45^{\circ}$
  4. $90^{\circ}$

     

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