Q. With reference to ionospheric propogation, an electromagnetic wave with a critical frequency of 15 MHz and incident at an angle of $45{^\circ}$ will have MUF of
A) 15 MHz
B) $15/\sqrt{2}$ MHz
C) $15\sqrt{2}$ MHz
D) None of these
Explanation
(c) $MUF = v\sec\theta = 15\sec{45{^\circ} = 15\sqrt{2}\ MHz}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.