Question

Sky wave propagation is not possible for waves of frequency $>30MHz$ because

• A. these waves do not have much energy to reach ionosphere.
• B. they are not reflected by ionosphere.
• C. they get absorbed by troposphere.
• D. they get reflected by stratosphere.

Answer 1

The correct option is B they are not reflected by ionosphere.

Stratosphere and troposphere allow the radio waves to pass through it but they are not reflected back to the Earth's surface by ionosphere.
Only frequency $1500kHz$ to $30MHz$ can be propagated by this mode.