Materials and Components
In a metal, the valence electrons

Are shared only between neighbouring atoms
Either B or C
Are shared by all atoms
Are not shared

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

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

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

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

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