Basic Qualification · B-006 Feedlines and antenna systems · B-006-008-004
The velocity of propagation of radio frequency energy in free space is:
- A300 000 kilometres per second
- B200 000 kilometres per second
- C150 000 kilometres per second
- D186 000 kilometres per second
Correct answer: A — 300 000 kilometres per second. From the official ISED question bank, verified word for word.
Why
Radio waves travel through empty space at the speed of light, which is exactly 300 000 kilometres per second. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account