Basic Qualification · B-005 Basic electronics and theory · B-005-007-002
Quelle est approximativement la gamme de fréquences qui peut être entendue par l'humain?
- ADe 200 Hz à 200 000 Hz
- BDe 300 Hz à 3 000 Hz
- CDe 20 Hz à 20 000 Hz
- DDe 20 Hz à 30 000 Hz
Correct answer: C — De 20 Hz à 20 000 Hz. Question tirée de la banque officielle d'ISDE.
Why
Most humans can hear sounds vibrating between 20 cycles per second and 20 000 cycles per second, which covers the full range of speech, music, and everyday noises. 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