Basic Qualification · B-007 Radio wave propagation · B-007-003-005
The distance to Europe from your location is approximately 5000 km. What type of high frequency (HF) propagation is the most likely to work?
- A Back scatter
- B Tropospheric scatter
- C Multi-hop
- D Sporadic "E"
Correct answer: C — Multi-hop. From the official ISED question bank, verified word for word.
Why
Multi-hop works best for this 5000 km distance because high frequency signals bounce between the ionosphere and the ground multiple times to cover such a long range, much like skipping a stone across a lake. The full explanation — and one for every question — is in Pro.
Practise this section
How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.