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(A) In a semiconductor, as the temperature increases, more covalent bonds are broken, which leads to an increase in the number of free electrons $(n_e

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$n_e$ increases and $v_d$ decreases

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(A) In a semiconductor, as the temperature increases, more covalent bonds are broken, which leads to an increase in the number of free electrons $(n_e)$.Thus, $n_e$ increases.However, the drift velocity $(v_d)$ is related to the relaxation time $(	au)$ by the formula $v_d = \frac{eE	au}{m}$.As temperature increases, the frequency of collisions between electrons and the lattice increases, which causes the relaxation time $(	au)$ to decrease.Consequently, the drift velocity $(v_d)$ decreases.Therefore, $n_e$ increases and $v_d$ decreases.

If $n_e$ and $v_d$ are the number of electrons and drift velocity in a semiconductor, respectively, what happens when the temperature is increased?

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