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CBSE Notes Class 12 2020 : Physics : Electronic devices

19 pages, 22 questions, 1 questions with responses, 1 total responses,

Jatin Vangani
Ambassador School, Dubai

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20 Days Pledge ELECTRONIC DEVICES 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. (ONE MARK QUESTIONS) What is an electronic device? Ans. It is a device in which controlled flow of electrons takes place either in vacuum or in semiconductors. What is an energy band in a solid? Ans. Energy band is a group of close by energy levels with continuous energy variation. What is a valence band? Ans. Valence band is the energy band which includes the energy levels of the valence electrons. It is the range of energies possessed by valence electrons. What is conduction band? Ans. Conduction band is the energy band which includes the energy levels of conduction electrons or free electrons. What is energy gap or energy band gap? Ans. The gap (spacing) between the top of the valence band (EV) and the bottom of the conduction band (Ec) is called the energy band gap (Eg) or energy gap. What is the order of energy gap in a semiconductor? Ans. 1eV At what temperature would an intrinsic semiconductor behave like a perfect insulator? Ans. 0 K (absolute zero temperature) What is an intrinsic semiconductor? Ans. It is a pure semiconductor in which electrical conductivity is solely due to the thermally generated electrons and holes. What is doping? Ans. The process of adding suitable impurity atoms to the crystal structure of pure semiconductor like Ge or Si to enhance their electrical conductivity is called doping. What is a hole? Ans. The vacancy of an electron(of charge -e) in the covalent bond with an effective positive charge +e is called a hole. What is an extrinsic semiconductor? Ans. The semiconductor obtained by doping a pure semiconductor like silicon with impurity atoms to enhance its conductivity is called an extrinsic or doped semiconductor. Name one dopant which can be used with germanium to form an n-type semiconductor. Ans. Phosphorus. What are dopants? Ans. The impurity atoms added to pure semiconductors like germanium to increase their electrical conductivity are called dopants. Name the majority charge carriers in p-type semiconductors. Ans. Holes. What is depletion region in a p-n junction? Ans. The space charge region at the p-n junction which consists only of immobile ions and is depleted of mobile charge carriers is called depletion region. How does the width of the depletion region of a p-n junction change when it is reverse biased? Ans. The depletion region width increases. What is the forward resistance of an ideal p-n junction diode? Ans. Zero. Draw the circuit symbol of a semiconductor diode. Ans. Physics Baba YOUTUBER

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