By increasing the temperature, the conductance of a conductor and a semiconductor _______

Concept Used:

Conductors and semiconductors show different behavior when temperature increases.

Conductors: With an increase in temperature, the vibration of lattice ions increases. This increases the scattering of electrons, which reduces their mobility and hence decreases conductance.

Semiconductors: With an increase in temperature, more charge carriers (electrons and holes) are thermally generated. This increases conductance.

Explanation:

According to the given statement, we need to select the correct description of conductance behavior for both a conductor and a semiconductor.

From the concept above:

For a conductor, conductance decreases with increasing temperature.

For a semiconductor, conductance increases with increasing temperature.

∴ The correct answer is Option 4: Decreases, Increases.