50
1. The nucleus of a copper atom contains how many protons?
a. 1
b. 4
c. 18
d. 29
d
2. The net charge of a neutral copper atom is
a. 0
b. +1
c. -1
d. +4
a
3. Assume the valence electron is removed from a copper atom. The net charge of the atom becomes
a. 0
b. + 1
c. -1
d. +4
4. The valence electron of a copper atom experiences what kind of attraction toward the nucleus?
a. None
b. Weak
c. Strong
d. Impossible to say
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?
a. Copper
b. Germanium
c. Silicon
d. None of the above
c
7. How many protons does the nucleus of a silicon atom contain?
a. 4
b. 14
c. 29
d. 32
8. Silicon atoms combine into an orderly pattern called a
a. Covalent bond
b. Crystal
c. Semiconductor
d. Valence orbit
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
a. Covalent bond
b. Free electron
c. Hole
d. Recombination
a
11. The merging of a free electron and a hole is called
a. Covalent bonding
b. Lifetime
c. Recommendation
d. Then-nal energy
c
12. At room temperature an intrinsic silicon crystal acts approximately like
