Basic Qualification · B-007 Radio wave propagation · B-007-001-005
Quel type d'onde est communément appelé onde de ciel?
- AL'onde ionosphérique
- BL'onde troposphérique
- CL'onde diffusée
- DL'onde d'espace
Correct answer: A — L'onde ionosphérique. Question tirée de la banque officielle d'ISDE.
Why
Sky waves are called Ionospheric waves because they travel by bouncing off the ionosphere, a layer of charged particles high in the atmosphere that reflects radio signals back to Earth. 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