Basic Qualification · B-007 Radio wave propagation · B-007-004-005
A transmitted radio signal reaches a receiver by both one-hop and two-hop skip paths. What can small changes in the ionosphere cause?
- AA shift in signal frequency
- BVariations in signal strength
- CConsistently weaker signals
- DConsistently stronger signals
Correct answer: B — Variations in signal strength. From the official ISED question bank, verified word for word.
Why
When a signal arrives via both one-hop and two-hop paths, the waves can either reinforce or cancel each other out depending on their alignment. 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