3.4 A uniform bar of n-type silicon of 2-µm length has a voltage of 1 V applied across it. If ND = 1016/cm3 and μn = 1350 cm2/V · s, find (a) the electron drift velocity, (b) the time it takes an electron to cross the 2-µm length, (c) the drift-current density, and (d) the resistance and drift current in the case that the silicon bar has a cross-sectional area of 0.25 µm2. 6.75 × 106 cm/s; 30 ps; 1.08 × 104 A/cm2; 37.0 kΩ, 27 µA