1.

Relation between MUF and critical frequency is ______

A. f<sub>c</sub> = f<sub>MUF</sub> sec <sub>i</sub>
B. f<sub>MUF</sub> = f<sub>c</sub> sec<sup>2</sup> <sub>i</sub>
C. f<sub>c</sub> = f<sub>MUF</sub> sin <sub>i</sub>
D. f<sub>MUF</sub> = f<sub>c</sub> sec <sub>i</sub>
Answer» E.


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