question_answer

The intrinsic conductivity of germanium at \[27{}^\circ \] is \[2.13\text{ }mho\text{ }{{m}^{-1}}\] and mobilities of electrons and holes are \[0.38\] and \[0.18\,{{m}^{2}}\,{{V}^{-1}}\,{{s}^{-1}}\]respectively. The density of charge carriers is

A)  \[2.37\times {{10}^{19}}{{m}^{-3}}\]

B)  \[3.28\times {{10}^{19}}{{m}^{-3}}\]

C)  \[7.83\times {{10}^{19}}{{m}^{-3}}\] 

D)  \[8.47\times {{10}^{19}}{{m}^{-3}}\]