The effective masses and mobilities of electrons and holes in Si, Ge and GaAs are given in the table below, along with their energy gaps. Calculate the conductivity and resistivity of these materials at room temperature. m*e/m0 m*h/m0 Me (cm2/V.s) h (cm2/V.s) Gap (eV) Si 0,26 0,38 1350 480 1,1 Ge 0,12 0,23 3900 1900 0,67 GaAs 0,068 0,5 8600 400 1,43