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5. How many valence electrons does a silicon atom have? a. 0 b. 1 c. 2 d. 4 d 6. Which is the most widely used semiconductor?
3 7. How many protons does the nucleus of a silicon atom contain? 8. Silicon atoms combine into an orderly pattern called a 9. An intrinsic semiconductor has some holes in it at room temperature. What causes these holes? a. Doping b. Free electrons c. Thermal energy d. Valence electrons c 10. Each valence electron in an intrinsic semiconductor establishes a 11. The merging of a free electron and a hole is called 12. At room temperature an intrinsic silicon crystal acts approximately like 13. The amount of time between the creation of a hole and its disappearance is called a. Doping b. Lifetime c. Recombination d. Valence b 14. The valence electron of a conductor is also called a 15. A conductor has how many types of flow? 16. A semiconductor has how many types of flow? 17. When a voltage is applied to a semiconductor, holes will flow a. Away from the negative potential b. Toward the positive potential c. In the external circuit d. None of the above d 18. A conductor has how many holes? 19. In an intrinsic semiconductor, the number of free electrons 20. Absolute zero temperature equals 21. At absolute zero temperature an intrinsic semiconductor has a. A few free electrons b. Many holes c. Many free electrons d. No holes or free electrons d 22. At room temperature an intrinsic semiconductor has
4 23. The number of free electrons and holes in an intrinsic semiconductor increases when the temperature