In transistors, the base region is very thin of the order of:
Correct answer: B. 10-6 m
- A. 10-5 cm
- B. 10-6 m
- C. 10-6 mm
- D. 10-6 µm
Explanation
The base region in a transistor is the central area that is lightly doped compared to the emitter and collector regions. It is designed to be very thin, typically around 10-6 meters or 1 micrometer, to allow efficient electron flow from the emitter to the collector. Option A (10-5 cm) is incorrect because it is too thick. Option C (10-6 mm) is incorrect because it does not match the correct scale. Option D (10-6 µm) is incorrect because it is too thin, as it suggests a thickness of one-millionth of a micrometer, which is not feasible for the base region.
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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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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