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CBSE - XII Science - Physics - Current Electricity

why on cooling a piece of copper and another of germanium from room temperature to 80*K increases the resistance of germanium while decreases that of copper.

Asked by ashik kumar 16th December 2011, 10:24 AM
Answered by Expert


on decreasing temperature, there will be less collision  in the free electrons of copper. so resistance will decrease.current will increase.
but in germenium, there will be less number of electrons available for flow. so current will be less.resistance will increase.
in semiconductors, as temperature increases, more and more electrons will be available in the lattice for more electrons will be going to conduction level from valence energy band.
Answered by Expert 19th December 2011, 12:28 PM

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