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a
Doping will increase conductivity of a pure semi conductor
b
Impurity atoms are called dopants
c
The highest energy that an electron can have at 0K is called Fermi energy
d
All the above are correct
answer is D.
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Detailed Solution
Doping will create more number of charge carriers in a pure Semi conductor (intrinsic semiconductor).Examples of dopant are pentavalent (arsenic) and trivalent (boron)