Given density of carrier is ${\text{1⋅6×10}}^{10}/{\mathrm{cm}}^3$, carrier mobilities for electron and holes at 300 K are 1500 and 500 cm²volt-sec, electronic charge $=1\cdot 602\times {10}^{-19}\mathrm{C}$  Then the conductivity at 300 K of pure silicon is

• A

  $2\cdot 18\times {10}^{-6}/\mathrm{\Omega }-\mathrm{cm}$

• B

  $1\cdot 19\times {10}^{-6}/\mathrm{\Omega }-\mathrm{cm}$

• C

  $5\cdot 13\times {10}^{-6}/\mathrm{\Omega }-\mathrm{cm}$

• D

  none of these