7. The resistivity of intrinsic Si is 2.3 x 10.m at 300 K. Calculate its resistivity at 100°C. Assume E, = 1 eV and k = 1.38 x 10-23 J/K. 8. The electrical conductivity of Ge at 20°C is 2 (N . m)-. What is its conductivity at 40°C? Bandgap of Ge is 0.72 ev. %3D 9. Assuming that the number of electrons near the top of the valence band available for thermal excitation is 5 x 1025 / m³ and the intrinsic carrier density is 2.5 x 1019 / m³, calculate the energy gap of germanium at room temperature.

7. The resistivity of intrinsic Si is 2.3 x 10.m at 300 K. Calculate its resistivity at 100°C. Assume E, = 1 eV and k = 1.38 x 10-23 J/K. 8. The electrical conductivity of Ge at 20°C is 2 (N . m)-. What is its conductivity at 40°C? Bandgap of Ge is 0.72 ev. %3D 9. Assuming that the number of electrons near the top of the valence band available for thermal excitation is 5 x 1025 / m³ and the intrinsic carrier density is 2.5 x 1019 / m³, calculate the energy gap of germanium at room temperature.