Propagation

Explanation of question 19

During the evening the

  1. F2 -layer falls to join the F1 -layer at a height of about 100km
  2. F1 -layer rises to join the F2 -layer at a height of about 500km
  3. F1 and F2 layers combine at a height of about 250km
  4. F1 and F2 layers separate further apart

The answer is :- 3 During the winter periods and at night the two F-layers combine at a height of about 250 km above earth.

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