For a short wave radio link between two stations via the

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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

Correct Option: B

Since we know that f_muf = f_c sec i
so,

f_muf	= sec i > 1
f_c