The impurity atoms which are mixed with pure silicon to make a $P$ type semiconductor are those of
A
Phosphorus
B
Boron
C
Antimony
D
Copper
[MP PMT 1995]
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B
Boron
Boron is trivalent.
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Wires $P$ and $Q$ have the same resistance at ordinary (room) temperature. When heated, resistance of $P$ increases and that of $Q$ decreases. We conclude that