A pentavalent impurity has ___________ Valence electrons

The strength of a semiconductor crystal comes from

A. Forces between nuclei

B. Forces between protons

C. Electron-pair bonds

D. None of the above

The impurity level in an extrinsic semiconductor is about of pure semiconductor.

A. 10 atoms for 108 atoms

B. 1 atom for 108 atoms

C. 1 atom for 104 atoms

D. 1 atom for 100 atoms

A hole and electron in close proximity would tend to ___________

A. Repel each other

B. Attract each other

C. Have no effect on each other

D. None of the above

A semiconductor has generally ___________ valence electrons.

A. 2

B. 3

C. 6

D. 4