Basic Qualification · B-007 Radio wave propagation · B-007-003-007
Sur un trajet à double saut impliquant la surface de la Terre comme point médian, quel phénomène renvoie l'onde radio vers l'ionosphère?
- ALa diffraction
- BLa diffusion
- CLa réflexion
- DLa réfraction
Correct answer: C — La réflexion. Question tirée de la banque officielle d'ISDE.
Why
When a radio wave hits the ground during a double-hop path, it bounces off the Earth's surface much like a ball bouncing off a wall, which is called reflection. 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