How does drift velocity of electrons in a metallic conductor vary with the rise of temperature?

How does drift velocity of electrons in a metallic conductor change, if the length of the conductor is doubled by stretching it, keeping the applied voltage constant?

How much is the drift velocity of electrons?

How does the drift speed of electrons in a metallic conductor vary, when applied potential difference is decreased keeping temperature constant?

How much is the drift velocitu of electrons?

How does resistivity of conductor vary with temperature?

How does conductivity of a semi conductor change with the rise in temperature ?

Derive an expression for drift velocity of free electrons in a conductor in terms of relaxation time.