# Propagation

### Explanation of question 14

The layer ‘X’ in Fig. 21.3 is the

1. D-layer, at a distance approximately 150km from earth
2. D-layer, at a distance approximately 200km from earth
3. E-layer, at a distance approximately 200km from earth
4. F1-layer, at a distance approximately 200km from earth

The answer is :- 4 The ionosphere basically consists of the

- D-layer, at a height of about 80 km
- E-layer, at a height of about 120 km
- F5-layer, at a height of about 200 km
- F2-layer, at a height of about 300—400 km

In the diagram, the D-layer has been omitted, and ‘X’ must represent the F1-layer, at a height of about 200 km.

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