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(A) Doping is the process of adding a small amount of impurity atoms to an intrinsic semiconductor to modify its electrical properties.When an impurit

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increases

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(A) Doping is the process of adding a small amount of impurity atoms to an intrinsic semiconductor to modify its electrical properties.When an impurity is added,it significantly increases the concentration of charge carriers (either free electrons in $n$-type or holes in $p$-type).Since conductivity $\sigma$ is directly proportional to the concentration of charge carriers ($n$ or $p$),the conductivity of the semiconductor increases significantly.Therefore,the correct option is $A$.

When an impurity is doped into an intrinsic semiconductor,the conductivity of the semiconductor

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