Physics · Solid State Physics

Optical excitation of intrinsic germanium creates an average density of 1012 conduction electrons per cm3 in the material at liquid nitrogen temperature. At this temperature, the electron and hole mobilities are equal, μ = 0.5 × 104 cm2 V-1 s-1. If 100 Volts is applied across a 1 cm cube of the crystal under these conditions, how much current is observed? [Charge of electron = 1.6 × 10-19 C]