Temperature dependence of resistivity p(T) of semiconductors, insulators and metals is significantly based on the following factors:

Options

A. number of charge carries can change with temperature T
B. time interval between two successive collisions can depend on T
C. length of material can be a function of T
D. mass of carriers is a function of T

Answer

A, B

Explanation

Resistivity of a conductor is given by `p=(m)/(ne^(2)tau)`, where the various terms have their usual meanings. As temperature of semiconducot r changes, n changes and also `tau` changes. Hence. P chagnes with temperature. This option (a) and (b) are true.