Q. Pick out the correct statement in the propagation of electromagnetic waves for communication purposes
A) Space wave propagation is achieved by ionospheric reflection
B) Sky wave propagation is used for line-of-sight communication
C) Electromagnetic waves of frequencies higher than $30\ MHz$ penetrate ionosphere
D) Satellite communication uses sky wave mode of propagation
Explanation
The correct answer is Option C: Electromagnetic waves of frequencies higher than $30\ MHz$ penetrate ionosphere.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.