Basic Qualification · B-007 Radio wave propagation · B-007-003-002
Quelle est la distance maximale, sur la surface de la Terre, que peut parcourir une onde radio réfléchie une seule fois par la couche ionosphérique F2?
- A12 000 km
- B2 000 km
- C300 km
- D4 000 km
Correct answer: D — 4 000 km. Question tirée de la banque officielle d'ISDE.
Why
The F2 region sits highest in the ionosphere, allowing radio waves to bounce off it and travel very far before returning to Earth, typically covering about 4 000 km in a single hop. The full explanation — and one for every question — is in Pro.
Practise this section
Radio wave propagation is section B-007 of the Basic exam: How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.
Drill B-007 — free, no account