Why does the electrical conductivity of a metal decrease with increase in temperature?

Why is the electrical conductivity of metals found to decrease with rise in temperature?

why does the electrical conductivity of semiconductors increse with rise in temperature?

The electrical conductivity of a metal decreases with rise in temperature while that of semi-conductor increases. Justify.

Between a semiconductor and a metal, whose electrical conductivity decreases on increasing temperature?

Why does the conductivity of a pure semiconductor increases with rise in temperature ?

Why does the conductivity of a solution decrease with dilution?

How does the electrical conductivity of super- conductors vary with temperature ?

(a) On raising the temperature, electrical conductivity of a metal decreases, while that of a semiconductor increases. Explain. (b) At very low temperature (0K), intrinsic semiconductors behave like insulators but their electrical conductivities increase with rise in temperature. Why?

Why does the electrical conductivity of germanium crystal increase when it is doped with gallium?

Resistivity of which of the following decreases with increase in temperature?