Question

Beyond which frequency, the ionosphere bands any incident electromagnetic radiation but do not reflect it back towards the earth?

• A. 50 MHz
• B. 40 MHz
• C. 30 MHz
• D. 20 MHz

Hint:

The ionosphere can reflect lower frequencies, but frequencies above a certain threshold (around 40 MHz) pass through without reflection.

Answer 1

The Correct Option is B

The ionosphere bands electromagnetic radiation in a range of frequencies, with higher frequencies passing through and not being reflected back. The critical frequency for reflection is around 40 MHz.