Basic Qualification · B-007 Radio wave propagation · B-007-001-008
Des bandes s'étendant de 160 mètres à 6 mètres, laquelle offre la plus grande portée par onde de sol?
- A160 mètres
- B40 mètres
- C10 mètres
- D6 mètres
Correct answer: A — 160 mètres. Question tirée de la banque officielle d'ISDE.
Why
Lower frequency radio waves travel farther along the ground because they lose less energy to the earth as they move. 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