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Q.

Choose the correct statement

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a

The energy level  occupied by the hole  due to trivalent doping which lies very close to valance band is called donor level.

b

Doping of large amount of Boron provide millions  of holes

c

Holes  are always formed in conduction band

d

The trivalent  foreign  atom becomes effectively negatively charged when it  shares fourth electron with  host germanium atom and one acceptor  atom gives one hole

answer is D.

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Detailed Solution

Option  A-  wrong because the energy  level   is acceptor level  B-  is wrong doping requires small amount of impurity  C- Holes are always  formed   in valance bond
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