Advanced Qualification · A-002 Advanced components and circuits · A-002-001-002
In what application is gallium-arsenide used as a semiconductor material in preference to germanium or silicon?
- AAt very low frequencies
- BIn bipolar transistors
- CAt microwave frequencies
- DIn high-power circuits
Correct answer: C — At microwave frequencies. From the official ISED question bank, verified word for word.
Why
Gallium-arsenide is a special semiconductor that lets electrons move much faster than in silicon or germanium, making it ideal for circuits handling very high-frequency signals like those at microwave frequencies. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account