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(A) Silicon is an intrinsic semiconductor. In semiconductors,the energy band gap between the valence band and the conduction band is small. As the tem

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(A) Silicon is an intrinsic semiconductor. In semiconductors,the energy band gap between the valence band and the conduction band is small. As the temperature increases,more electrons gain sufficient thermal energy to jump from the valence band to the conduction band. This results in an increase in the number of charge carriers (both electrons and holes). Since conductivity $\sigma$ is directly proportional to the number density of charge carriers,the conductivity of silicon increases with an increase in temperature.

When the temperature of a silicon sample is increased from $27^\circ C$ to $100^\circ C$,the conductivity of silicon will be

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