Q.
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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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