Choose the $FALSE$ statement from the following.
- AGenerally,in conductors the valence and conducting bands overlap.
- BThe resistivity of a semiconductor increases with increase in temperature.
- CThe conductivity of a semiconductor increases with increase in temperature.
- DSubstances with an energy gap of the order of $10 \ eV$ are insulators.
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Carbon, silicon, and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g)_C$, $(E_g)_{Si}$, and $(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?
The expected energy of the electrons at absolute zero is called
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View SolutionThe valence band and conduction band of a solid overlap at low temperature. The solid may be:
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View SolutionAt $0 \ K$,a piece of germanium:
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View SolutionIn the case of insulators,the band gap and the conduction band are respectively:
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