middlemarch
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This question is from the cssa '01 trial
If an atom from group 3 is used as the impurity in a semiconductor, conductivity increases because of an:
a) increase in no. of free electrons
b) alteration to the metal lattice of the semiconductor.
c) increase in no. of +ve holes in crystal lattice
d) increase in energy of the conduction band
The answer is supposed to be a).
Can anybody explain why it's not C?
Thx
Middle
If an atom from group 3 is used as the impurity in a semiconductor, conductivity increases because of an:
a) increase in no. of free electrons
b) alteration to the metal lattice of the semiconductor.
c) increase in no. of +ve holes in crystal lattice
d) increase in energy of the conduction band
The answer is supposed to be a).
Can anybody explain why it's not C?
Thx
Middle