NEET Physics Semiconductor Electronics Questions Solved

A Ge specimen is doped with Al. The concentration of acceptor atoms is ~1021 atoms/m3. Given that the intrinsic concentration of electron hole pairs is ~1019/m3, the concentration of electrons in the specimen is 
(a) 1017/m3         (b) 1015/m3
(c) 104/m3           (d) 102/m3

(a) ni2=nhne10192=1021×nene=1017/m3

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