Temperature dependence of resistivity ρ(T) of semiconductors, insulators, and metals is significantly based on the following factors: a) number of charge carriers 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
Correct options are A) and B) We know that resistivity ( ρ ) depends on mass of charge-carrier (m), relaxation time ( τ ). Length and mass cannot be function of T as the mass of a body is constant everywhere. So discards answer (d) and length of body changes negligibly with temperature discards answer (c). As τ decreases on increasing T due to the rise in the speed of change-carriers and n increases on increasing temperature. So will affect the ρ or ρ is the function of T verifies answers (a) and (b)
