Basic Qualification · B-007 Radio wave propagation · B-007-002-005
Quelle couche de l'ionosphère se sépare en deux sous-couches durant le jour?
- ALa couche E
- BLa couche
- CLa couche G
- DLa couche F
Correct answer: D — La couche F. Question tirée de la banque officielle d'ISDE.
Why
The F region splits into two distinct layers, called F1 and F2, only when the sun is up, because solar radiation ionizes the upper atmosphere differently during daylight hours. 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