Basic Qualification · B-006 Feedlines and antenna systems · B-006-008-007
The speed of a radio wave:
- A is constant
- B is less than half the speed of light
- C varies depending on the frequency
- D is the same as the speed of light
Correct answer: D — is the same as the speed of light. From the official ISED question bank, verified word for word.
Why
Radio waves are a form of light, so they travel at the exact same speed as visible light when moving through empty space or air. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.