Basic Qualification · B-005 Basic electronics and theory · B-005-007-004
Dans quelle gamme de fréquences se situe une énergie électrique à la fréquence de 7125 kHz?
- AHautes fréquences (HF)
- BBasses fréquences (LF)
- CMoyennes fréquences (MF)
- DTrès hautes fréquences (VHF)
Correct answer: A — Hautes fréquences (HF). Question tirée de la banque officielle d'ISDE.
Why
7125 kHz equals 7.125 megahertz, which sits squarely inside the High Frequency band that spans from 3 to 30 megahertz. The full explanation — and one for every question — is in Pro.
Practise this section
Basic electronics and theory is section B-005 of the Basic exam: The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.
Drill B-005 — free, no account