Carbon, Silicon and Germanium atoms have limn valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_{g})_{c}, (E_{g})_{s i}$ and $(E_{g})_{G e}$ respectively. Which one of the following relationship is true in their case?

(E_{g})_{C} > (E_{g})_{s i}

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(E_{g})_{C} < (E_{g})_{s i}

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(E_{g})_{C} = (E_{g})_{s i}

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(E_{g})_{C} < (E_{g})_{G e}

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Solution

The correct option is A $(E_{g})_{C} > (E_{g})_{s i}$
As carbon is much more electronegative than silicon and germanium, thus the electrons are strongly bound with the carbon atom compared to that in silicon and germanium. Thus more energy is required for the electron in carbon to jump from valence band to conduction band.
The correct order of energy band gaps, $(E_{g})_{C} > (E_{g})_{s i} > (E_{g})_{G e}$

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Similar questions

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E_g)_C, (E_g)_Siand (E_g)_Ge. Which of the following statements is true?

(a) (E_g)_Si< (E_g)_Ge < (E_g)_C

(b) (E_g)_C < (E_g)_Ge > (E_g)_Si

(d) (E_g)_C = (E_g)_Si= (E_g)_Ge

Q. 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)_{S i}

, and

(E g)_{G e}

respectively. Which one of the following relationships is true in their case:

Q. CEG : EGC :: LNP : ?

Q. Assertion :If there is some gap between the conduction band and the valence band, electrons in the valence band all remain bound, and no free electrons are available in the conduction band. Reason: Some of the electrons in the valence band may gain external energy to cross trhe gap between the conduction band and the valence band.

Q. Assertion :In some solids, the valence band is completely filled while the next higher band separated by an energy gap of few electrons-volts is completely empty. Reason: In insulators the energy band completely filled with electrons( the valence band) and above it is empty band (the conduction band)

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Carbon, Silicon and Germanium atoms have limn valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)c,(Eg)si and (Eg)Ge respectively. Which one of the following relationship is true in their case?

Carbon, Silicon and Germanium atoms have limn valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_{g})_{c}, (E_{g})_{s i}$ and $(E_{g})_{G e}$ respectively. Which one of the following relationship is true in their case?