What is the refractive index of the region operating at 16MHz frequency with the electron density 49×10^10/cm^3?
(a) 0.518
(b) 0.919
(c) 0.155
(d) 0.845
I had been asked this question in an internship interview.
This intriguing question comes from Maximum Usable Frequency topic in chapter Virtual Height, Critical Frequency and Muf of Antennas