The resistivity of intrinsic germanium at 30°C is 0.46 Ω-m. What is the intrinsic carrier density ni, at 30°C, taking the electron mobility μn as 0.38 m2/V-s and hole mobility μp, as 0.18 m2/V-s?

• A. 2.4 × 1019/m3
• B. 4.2 × 1019/m3
• C. 2.4 × 1010/m3
• D. 4.2 × 1010/m3