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Medical Entrance (NEET ,AIIMS,JIPMER,AFMC,State Exams)

Posted on Feb 17, 2018 11:40 AM

Conductivity of semi conductors increased in heating but it decreases in case of conductors why?


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Because in conductor on increasing the temp tau( time period between collision of two elecron ) decreases and hence frift velocity decreases but resistivity increases by eqn I = neAVd nnin semiconductor no of electron increasrs as compare to tau more and hence current increases on increasing temperature.

Conductivity depends on temperature coefficient of resistance