# Propagation

### Explanation of question 15

In Fig. 21.4, AB represents a ground wave. Skip distance is given by distance

1. E to F
2. B to D
3. A to F
4. A to D

The answer is :- 2 No ground wave can be received beyond distance A B. No ionospheric wave can be received before distance Al). The ‘dead distance’ or skip distance is therefore distance BD. Note that these distances are not straight lines, due to the curvature of the earth.

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