# NEET Physics Semiconductor Electronics Questions Solved

A Ge specimen is doped with Al. The concentration of acceptor atoms is . Given that the intrinsic concentration of electron hole pairs is $~{10}^{19}/{\mathrm{m}}^{3}$, the concentration of electrons in the specimen is
(a) ${10}^{17}/{\mathrm{m}}^{3}$         (b) ${10}^{15}/{\mathrm{m}}^{3}$
(c) ${10}^{4}/{\mathrm{m}}^{3}$           (d) ${10}^{2}/{\mathrm{m}}^{3}$