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Q.

When a semiconductor is doped with donor impurity

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a

the hole concentration decreases and electron concentration increases

b

the hole concentration increases and electron concentration decreases

c

both hole concentration and electron concentration increase

d

both hole concentration and electron concentration decrease 

answer is A.

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Detailed Solution

A semiconductor is when doped with a donor impurity will increase the concentration of electron and at the same time donor impurities will decrease the hole concentration by favouring recombination of the hole electron pair.

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When a semiconductor is doped with donor impurity