The Amateur Radio Project - Propagation

# Propagation

### Question 19 of 30

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

1 | 2 | 3 | 4

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