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Carbon , silicon and germanium have four...

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 ?

A

(a) ` (E_g)_(Si) lt (E_g)_(Ge) lt (E_g) _C `

B

(b ) ` (E_g)_(C ) lt (E_g)_(Ge) gt (E_g)_Si `

C

(c ) ` (E_g)_(C ) gt (E_g)_(Si) gt (E_g) _(Ge) `

D

(d)`(E_g)_C = (E_g)_(Si) = (E_g)_(Ge)`

Text Solution

Verified by Experts

The correct Answer is:
C
`E_g "Carbon" = 5.4 eV `
`E_g "silicon" = 1.1 eV `
` E_g "Germanium" = 0.7 eV`
` :. (E_g)_C gt (E_g)_(Si) gt (E_g)_(Ge)`
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