Basic Qualification · B-007 Radio wave propagation · B-007-003-003
What is the maximum distance along the Earth's surface that is normally covered in one hop using the E region?
- A 300 km
- B 4000 km
- C 1000 km
- D 2000 km
Correct answer: D — 2000 km. From the official ISED question bank, verified word for word.
Why
The E region of the ionosphere sits lower than the F region, so it reflects radio waves back to Earth at a shorter angle, typically allowing a single bounce to cover about 2000 km. 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.