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(C) The resistivity of a material depends on the temperature coefficient of resistance,denoted by $\alpha$.For conductors,the value of $\alpha$ is pos

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increases,decreases

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(C) The resistivity of a material depends on the temperature coefficient of resistance,denoted by $\alpha$.For conductors,the value of $\alpha$ is positive. As temperature increases,the collision frequency of electrons with the lattice increases,leading to an increase in resistivity.For semiconductors,the value of $\alpha$ is negative. As temperature increases,more charge carriers (electrons and holes) are generated due to the breaking of covalent bonds,which significantly increases conductivity and thus decreases resistivity.Therefore,with an increase in temperature,the resistivity of a conductor increases and that of a semiconductor decreases.

With an increase in temperature,the resistivity of a conductor ........ and the resistivity of a semiconductor ....... .

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