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Question:

The temperature dependence of resistances of Cu and undoped Si in the temperature range 300K, is best described by:

Linear increase for Cu, linear increase for Si.

Linear increase for Cu, exponential increase for Si.

Linear decrease for Cu, linear decrease for si.

Linear increase for Cu, exponential decrease for Si.

Solution:

Resistance of a conductor increases linearly with temperature. R=Ro(1+αΔT) Resistance of semiconductor decreases with temperature. Conductivity, σ=Ce^(-Eg/2kT)