A) greater than one
B) less than one
C) equal to one
D) decreases and becomes zero
Correct Answer: C
Solution :
A semiconductor in which electrons and holes are created solely by thermal excitation cross the energy gap is called an intrinsic semiconductor. The electrons reaching conduction band due to thermal excitation leave equal number of vacancies or holes in valence band ie, in intrinsic semiconductor concentration of holes and electrons must always be the same.
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