An electricity and magnetism problem by S M
In a semiconductor,
A. there are no free electrons at 0K
B. there are no free electrons at any temperature
C. the number of free electrons increases with temperature
D. the number of free electrons is less than that in a conductor.
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1 solution
Properties of a semiconductor.
Conductivity of a semiconductor increases with increase in temperature as its resistivity is inversely proportional to temperature, unlike a conductor. And, hence there will be no free electrons to cause conductance at 0K. But, the number of free electrons increases with increase in temperature, to increase its conductivity. The number of free electrons in a semiconductor is less than that of a conductor, at a given temperature.