A photodiode is a semiconductor device that converts incident light into an electrical current. Due to its fast response time, photodiodes can detect rapid changes in light intensity and are therefore used in high-speed counting and detection applications, including optical counting systems.
The device which is used as fast counters in electronics is ______.
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Question context
This question is part of 📡 Electronics and Communication Engineering (ECE) within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.