Basic Qualification · B-007 Radio wave propagation · B-007-003-007
On a double-hop path involving the surface of the Earth as a middle point, what phenomenon returns the radio wave to the ionosphere?
- A Refraction
- B Diffraction
- C Scattering
- D Reflection
Correct answer: D — Reflection. From the official ISED question bank, verified word for word.
Why
When a radio wave hits the ground during a double-hop path, it bounces off the Earth's surface much like a ball bouncing off a wall, which is called reflection. 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.