Carbon, silicon and germanium have four ...

NCERT Class XII Chapter
Semiconductor Electronics
Questions With Solutions

Question : 3 of 19

Marks: +1, -0

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)_{Si}

and

(E_g)_{Ge}

. Which of the following statements is true?

$(E_g)_{Si}$ < $(E_g)_{Ge}$ < $(E_g)_C$
$(E_g)_C$ < $(E_g)_{Ge}$ > $(E_g)_{Si}$
$(E_g)_C$ > $(E_g)_{Si}$ > $(E_g)_{Ge}$
$(E_g)_C$ = $(E_g)_{Si}$ = $(E_g)_{Ge}$

Solution:

The energy band gap is largest for carbon, less for silicon and least for germanium.

So, the correct statement is (c).

(E_g)_C

(E_g)_{Si}

(E_g)_{Ge}

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NCERT Class XII Chapter Semiconductor Electronics Questions With Solutions

NCERT Class XII Chapter
Semiconductor Electronics
Questions With Solutions