# 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 (Eg)C, - Physics

MCQ

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 (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true?

#### Options

• (Eg)Si < (Eg)Ge < (Eg)C

• (Eg)C < (Eg)Ge > (Eg)Si

• (Eg)C > (Eg)Si > (Eg)Ge

• (Eg)C = (Eg)Si = (Eg)Ge

#### Solution

(Eg)C > (Eg)Si > (Eg)Ge

Explanation:

Of the three given elements, the energy band gap of carbon is the maximum and that of germanium is the least.

The energy band gap of these elements are related as: (Eg)C > (Eg)Si > (Eg)Ge

Concept: Special Purpose P-n Junction Diodes
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#### APPEARS IN

NCERT Physics Part 1 and 2 Class 12
Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
Exercise | Q 14.3 | Page 497
NCERT Class 12 Physics Textbook
Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
Exercise | Q 3 | Page 509

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