Basic Qualification · B-007 Radio wave propagation · B-007-005-005
What influences all radiocommunication beyond ground wave or line-of-sight ranges?
- AThe F1 region of the ionosphere
- BLunar tidal effects
- CSolar radiation
- DThe F2 region of the ionosphere
Correct answer: C — Solar radiation. From the official ISED question bank, verified word for word.
Why
Solar radiation, the energy emitted by the Sun, is the driving force behind the ionosphere, the layer of charged particles that bends radio waves back to Earth for long-distance communication. 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