A) There are no free electrons at room temperature
B) There are no free electrons at OK
C) The number of free electrons increases with rise of temperature
D) The charge carries are electrons and holes
Correct Answer: A
Solution :
The semiconductor, no covalent bond breaks at OK, so, no electron is free at OK. At room temperature some covalent bonds break, so, some electrons and holes become free. More covalent bonds break at high-temperature and so, number of free electrons increases at high temperature.
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