Basic Qualification · B-007 Radio wave propagation · B-007-001-008
Considering the bands from 160 metres to 6 metres, which band offers the greatest ground-wave propagation distance?
- A 40 metres
- B 10 metres
- C 6 metres
- D 160 metres
Correct answer: D — 160 metres. From the official ISED question bank, verified word for word.
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
How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.