The class of semiconductors, known as elemental, has special features. These are ________.
A) band gap and individual element valence electrons
B) periodical table grouping and diamond crystal structure
C) tetrahedral coordination geometry and sp2 hybrid orbitals
D) overlapping hybrid orbitals and filed conduction bands
E) none of the above
Correct Answer:
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Q44: 18 karat gold contains _% gold.
A)18
B)25
C)89
D)75
E)1.0 ×
Q45: Which will have a larger band gap:
Q46: A category _ plastic container will generally
Q47: Blue LEDs are usually made of _.
A)GaAs
B)GaP
C)GaO
D)GaS
E)GaN
Q48: Sterling silver is _.
A)an alloy of silver
B)pure
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