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

Explanation

When an impurity is doped into an intrinsic semiconductor, it significantly alters the semiconductor's conductivity. Doping involves adding impurities to the semiconductor material to increase its electrical conductivity. The type of impurity determines the increase in conductivity:N-Type Semiconductor: Adding donor atoms from Group V (such as phosphorus) introduces extra electrons, which enhances electron conductivity.P-Type Semiconductor: Adding acceptor atoms from Group III (such as boron) creates holes, which enhances hole conductivity.Both methods effectively increase the number of charge carriers in the semiconductor, thereby increasing its overall conductivity. Therefore, the correct answer is that the conductivity Increases. The other options are incorrect because they do not align with the purpose and effect of doping in semiconductors.