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CGPET 2021 Solved Paper
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© examsnet.com
Question : 47
Total: 150
The forbidden energy gap in conductor, semiconductors and insulators are
E
G
1
,
E
G
2
and
E
G
3
, respectively. The reation among them is
E
G
1
=
E
G
2
=
E
G
3
E
G
1
>
E
G
2
>
E
G
3
E
G
1
<
E
G
2
<
E
G
3
E
G
1
<
E
G
2
>
E
G
3
Validate
Solution:
Substance
Forbidden energy gap
Conductor
E
G
1
(Zero or very small)
Semiconductor
E
G
2
(
G
e
=
0.2
e
V
,
S
i
=
0.7
e
V
)
Insulator
E
G
3
(Very large)
It is clear from above observations,
EG
1
<
EG
2
,
EG
3
© examsnet.com
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