Basic Qualification · B-007 Radio wave propagation · B-007-005-005
Qu'est-ce qui influence toute radiocommunication au-delà des ondes de sol et de la propagation en visibilité directe?
- ALes effets de la Lune sur les marées
- BLe rayonnement solaire
- CLa couche F2 de l'ionosphère
- DLa couche F1 de l'ionosphère
Correct answer: B — Le rayonnement solaire. Question tirée de la banque officielle d'ISDE.
Why
Solar radiation, the energy emitted by the Sun, is the driving force behind the ionosphere, the layer of charged particles that bends radio waves back to Earth for long-distance communication. 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