Topic: Electromagnetics
For a short wave radio link between two stations via the ionosphere, the ratio of the maximum usable frequency to the critical frequency
- A. is always less than 1
- B. May be $\le1$ depending on the distance between the two stations
- C. is always greater than 1
- D. Does not depend on the distance between the two stations
Answer: C. is always greater than 1
Explanation: $f_{muf}\ge f_{c}$\n$\frac{f_{muf}}{f_{c}}\ge1$