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# An electron losely bound to the impurity of a doped semiconductor is able to jump to the conducting band because of thermal collision at temperature T k. If the impurity level is 15 mev below the conducting band, calculate the temperature.

$(a)\;348\;K \\ (b)\;174\;K \\ (c)\;273\;K \\ (d)\;126\;k$

The thermal energy associated with temperature T K is $E= kT$
$k= 8.62 \times 10^{-5}$
$\therefore 15 \times 10^{-5} ev =T \times 8.62 \times 10^{-5}$
$T=\large\frac{0.015}{8.62 \times 10^{-5}}$
$\quad= 174 \;K$
Hence b is the correct answer.