A) There are no free electrons at room temperature
B) There are no free electrons at 0 K
C) The number of free electrons increases with rise of temperature
D) The charge carriers are electrons and holes
Correct Answer: A
Solution :
In semiconductor, no covalent bond breaks at \[0K\] so, no electron is free at\[0K\]. 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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