Basic Qualification · B-007 Radio wave propagation · B-007-001-009
What type of radio wave follows a path from the transmitter to the ionosphere and back to Earth?
- A Plane wave
- B Sky wave
- C Direct wave
- D Scattered wave
Correct answer: B — Sky wave. From the official ISED question bank, verified word for word.
Why
A sky wave is the name for a radio signal that travels upward, bounces off the ionosphere (a layer of charged particles high in the atmosphere), and returns to Earth far from the transmitter. 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.