In a semiconductor,which of the following sta | vedclass

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(B) In a semiconductor,at $0\, K$,the valence band is completely filled and the conduction band is completely empty,meaning there are no free electron

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$(i), (iii), (iv)$

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(B) In a semiconductor,at $0\, K$,the valence band is completely filled and the conduction band is completely empty,meaning there are no free electrons. Thus,statement $(i)$ is correct.As temperature increases,thermal energy allows electrons to jump from the valence band to the conduction band,creating free electrons. Thus,statement $(iii)$ is correct.Since semiconductors have a band gap,the concentration of free electrons is significantly lower than in conductors (metals),where the valence and conduction bands overlap. Thus,statement $(iv)$ is correct.Statement $(ii)$ is incorrect because free electrons are generated at temperatures above $0\, K$.Therefore,the correct statements are $(i), (iii),$ and $(iv)$.

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In a semiconductor,which of the following statements are correct?$(i)$ There are no free electrons at $0\, K$.$(ii)$ There are no free electrons at any temperature.$(iii)$ The number of free electrons increases with temperature.$(iv)$ The number of free electrons is less than that in a conductor.