Given below are two statements: Statement-I: The resistivity of a conductor is independent of its temperature. Statement-II: The resistivity of a semiconductor decreases with increase in temperature. Select the correct option.

Step-by-step solution

The resistivity of a conductor increases with an increase in temperature due to an increase in the collision frequency of free electrons with the lattice ions. Thus, Statement-I is false. The resistivity of a semiconductor decreases with an increase in temperature because the number density of charge carriers (electrons and holes) increases exponentially with temperature, which dominates over the effect of increased collision frequency. Thus, Statement-II is true. Therefore, Statement I is false but Statement II is