Carbon , silicon and germanium have four valence elcectrons 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 ture ?

Options

A. `(E_(g))_(C)gt(E_(g))_(Si)`
B. `(E_(g))_(C)=(E_(g))_(Si)`
C. `(E_(g))_(C)lt(E_(g))_(Ge)`
D. `(E_(g))_(C)lt(E_(g))_(Si)`

Answer

A

Explanation

(a) Carbon, silicon and germanium are semiconductors.
`(E_(g))_(C)=5.2 eV`
`(E_(g))_(Si)=1.21 eV`
`(E_(g))_(Ge)=0.75 eV`
Thus, `(E_(g))_(C)gt(E_(g))_(Si)` and `(E_(g))_(C)gt(E_(g))_(Ge)`