The specially designed semiconductor diodes used as fast counters in electronic circuit are:
Correct answer: C. Photo diodes
- A. Solar cells
- B. Light emitting diodes
- C. Photo diodes
- D. None of these
Explanation
A photodiode is a semiconductor device that generates a flow of current in response to incident light or photons. It works on the principle of the photoelectric effect, where photons of sufficient energy striking the semiconductor material within the diode cause the generation of electron-hole pairs. It can turn its current off and on within nano seconds and is the fastest photo detection device.
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A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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