The specially designed semi-conductor diodes used as fast counters in electronic circuits are_______________?
Correct answer: B. Photo diodes
- A. The light emitting diodes
- B. Photo diodes
- C. Photo voltaic cell
- D. Solar cells.
Explanation
A photodiode is a semiconductor diode designed to respond rapidly to incident light, so it can convert light pulses into electrical pulses for fast counting circuits. Students may choose an LED because it is also a light-sensitive-looking diode, but an LED primarily emits light rather than detecting it.
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About PN Junction
A PN junction forms when p type and n type semiconductor regions meet, creating a depletion layer and a potential barrier. The topic covers forward and reverse bias, diode current voltage characteristics, breakdown and rectification, while distinguishing an ordinary junction diode from a transistor formed from multiple junctions.
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