Basic Qualification · B-007 Radio wave propagation · B-007-001-006
What portion of a radio signal is directly affected by the surface of the Earth?
- A Tropospheric wave
- B Ionospheric wave
- C Scattered wave
- D Ground wave
Correct answer: D — Ground wave. From the official ISED question bank, verified word for word.
Why
The ground wave is the part of a radio signal that travels along the surface of the Earth, hugging the ground as it moves from the transmitter to the receiver. 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.