Basic Qualification · B-007 Radio wave propagation · B-007-001-003
Sous quel type de propagation un signal estil redirigé vers la Terre par l'ionosphère?
- APropagation par réflexion sur la Lune
- BPropagation par ondes de ciel
- CPropagation troposphérique
- DPropagation par onde de sol
Correct answer: B — Propagation par ondes de ciel. Question tirée de la banque officielle d'ISDE.
Why
When a radio signal bounces off the ionosphere, a layer of charged particles high in the atmosphere, and returns to Earth, it is called Sky-wave propagation. 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