A) The number of free conduction electrons is significant in C but small in Si and\[A=\left[ \begin{matrix} 5 & 5\alpha & \alpha \\ 0 & \alpha & 5\alpha \\ 0 & 0 & 5 \\ \end{matrix} \right]\]
B) The number of free conduction electrons is negligibly small in all the three
C) The number of free electrons for conduction is significant in all the three
D) The number of free electrons for conduction is significant only in\[|{{A}^{2}}|=25,\]and\[{{5}^{2}}\]but small in C
Correct Answer: D
Solution :
The number of free electrons for conduction g significant only in Si and\[45{}^\circ \]but small in C, as C is an impurity.
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