Basic Qualification · B-006 Feedlines and antenna systems · B-006-008-007
La vitesse d'une onde radio:
- Aest constante
- Best inférieure à la demie de la vitesse de la lumière
- Cvarie selon la fréquence
- Dest la même que celle de la lumière
Correct answer: D — est la même que celle de la lumière. Question tirée de la banque officielle d'ISDE.
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
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