Suppose a ray is incident normally in the ionosphere region with electron density 36×10^10/cm^3, then the critical frequency is _____
(a) 5GHz
(b) 54MHz
(c) 5.4MHz
(d) 324GHz
This question was posed to me by my school principal while I was bunking the class.
Origin of the question is Maximum Usable Frequency in section Virtual Height, Critical Frequency and Muf of Antennas