First slide

Classification of semi-conductors

Question

For germanium crystal,the forbidden energy gap in joules is

Moderate

A

$1.12 \times 10^{- 19}$
B

$1.76 \times 10^{- 19}$
C

$1.6 \times 10^{- 19}$
D

Zero

Solution

For Ge,
$Eg = 0.7 eV = 0.7 x 1.6 x 10^{- 19} J = 1.12 x 10^{- 19} J$

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