For intrinsic Si at room temperature, the electron concentration = the hole concentration = 1 × 10¹⁶m⁻³, and the electron and hole mobilities are 0.1 and 0.2 m². V⁻¹. s⁻¹ respectively. What is the room temperature electrical conductivity? The charge of an electron is 1.6 × 10⁻¹⁹C.

(A) 0 (W.m)^{– 1}                                                (B) 1.6 × 10 ^{– 4} (W.m)^{– 1}

(C) 3.2 × 10 ^{– 4} (W.m)^{– 1}                                 (D) 4.8 × 10 ^{– 4} (W.m)^{– 1}