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NEET 2005 (AIPMT) · Energy Bands in Solids

Energy Bands in Solids question from NEET 2005 (AIPMT)

Q19NEET 2005 · AIPMTEasy

Energy Bands in Solids

Carbon, silicon and germanium atoms have four 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 relationships is true in their case?

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Answer: (a)

Band gaps: carbon (diamond) $E_g \approx 5.4\text{ eV}$ , Si $1.1\text{ eV}$ , Ge $0.7\text{ eV}$ .
So $(E_g)_C > (E_g)_{Si} > (E_g)_{Ge}$ .
So the answer is (a) $(E_g)_C > (E_g)_{Si}$ .

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