# 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.

BACK

page (tq2119ex)
Some material Copyright John Bowyer G4KGS.
Click here for important Copyright information
Web Space provided by Hostroute.com Ltd
Contact details