Materials and Components
The residual resistivity of a binary alloy at 0 K is

Product of residual resistivities of component metals
Difference of residual resistivities of component metals
Sum of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is almost equal to the number of valence electrons
Is about half the number of valence electrons
Is a very small fraction of the number of valence electrons
Is small as compared to the number of valence electrons

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