Question

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? (a) (Eg)Si < (Eg)Ge < (Eg)C (b) (Eg)C < (Eg)Ge > (Eg)Si (c) (Eg)C > (Eg)Si > (Eg)Ge (d) (Eg)C = (Eg)Si = (Eg)Ge

Answer 1

Dear Student,

# Energy band gap -

• It is the minimum energy that is required to excite an electron up to a state in the conduction band where it can participate in conduction.

◆ Answer -

(Eg)C > (Eg)Si > (Eg)Ge

● Explaination -

• From the given options, germanium have lowest while carbon have highest energy band gap. Energy gap of silicon lies in between.
• Hence, we can arrange them according to energy gap as -

(Eg)C > (Eg)Si > (Eg)Ge

Thanks dear...

Answer 2

Answer:

hope it was helpful for more qualified answers please follow sypraveen141004

answer written by sypraveen