Relation between MUF and critical frequency is ______
(a) fc = fMUF secθi
(b) fMUF = fc sec^2 θi
(c) fc = fMUF sinθi
(d) fMUF = fc secθi
The question was asked in semester exam.
My question comes from Maximum Usable Frequency topic in portion Virtual Height, Critical Frequency and Muf of Antennas