Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is 10^{19}m^{–3} and their mobility is 1.6 m^{2}/(V.s) then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to:

(1) 2$Ω$m

(2) 0.4$Ω$m

(3) 4$Ω$m

(4) 0.2$Ω$m