Why conductivity of silicon increases with temperature?
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increase with the rise in temperature. and electrons do not have sufficient energy to jump into conduction band to contribute in conduction but when temperature is raised the electrons quire enough energy to jump into conduction band hence 

Explanation

and electrons do not have sufficient energy to jump into conduction band to contribute in conduction but when temperature is raised the electrons quire enough energy to jump into conduction band hence resulting in increase in conductivity