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(D) In a pure semiconductor,the energy gap between the valence band and the conduction band is small. As the temperature increases,thermal energy allo

Vedclass · Accepted Answer

Statement $1$ is true,Statement $2$ is true,Statement $2$ is the correct explanation of Statement $1$.

Vedclass · Answer

(D) In a pure semiconductor,the energy gap between the valence band and the conduction band is small. As the temperature increases,thermal energy allows more electrons to jump from the valence band to the conduction band. This increases the number of charge carriers (electrons and holes),which leads to a decrease in the resistance of the semiconductor. Since resistance decreases as temperature increases,the temperature coefficient of resistance is negative. Therefore,Statement $1$ is true,and Statement $2$ is the correct explanation of Statement $1$.

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