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GATE ECE 1994 | Question-17

For a short wave radio link between two stations via the ionosphere, the ratio of the maximum usable frequency to the critical frequency

  1. is always less than $1$
  2. is always greater than $1$
  3. may be less than or more than $1$ depending on the distance between the two stations
  4. does not depend on the distance between the two stations
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