An n-type semiconductor is known to have an electron concentrati An n-type semiconductor is known to have an electron concentration of 3 ( 1018 m-3. If the electron drift velocity is 100 m/s in an electric field of 500 V/m, calculate the conductivity of this material.
An FCC iron-carbon alloy initially containing 0.35 wt% C is An FCC iron-carbon alloy initially containing 0.35 wt% C is exposed to an oxygen-rich and virtually carbon-free atmosphere at 1400 K (1127(C). Under these circumstances the carbon diffuses from the alloy and reacts at the surface with the oxygen in the atmosphere; that is, the […]
An FCC iron-carbon alloy initially containing 0.20 wt% C is An FCC iron-carbon alloy initially containing 0.20 wt% C is carburized at an elevated temperature and in an atmosphere wherein the surface carbon concentration is maintained at 1.0 wt%. If after 49.5 h the concentration of carbon is 0.35 wt% at a position 4.0 mm […]
Compute the mass fractions of proeutectoid ferrite and pearlite Compute the mass fractions of proeutectoid ferrite and pearlite that form in an iron窶田arbon alloy containing 0.25 wt% C.
Compute the difference in energy between metastable and ground Compute the difference in energy between metastable and ground electron states for the ruby laser.
Compute the mass fractions of liquid in the following refractory Compute the mass fractions of liquid in the following refractory materials at 1600째C (2910째F): (a) 6 wt% Al2O3-94 wt% SiO2 (b) 10 wt% Al2O3-90 wt% SiO2 (c) 30 wt% Al2O3-70 wt% SiO2 (d) 80 wt% Al2O3-20 wt% SiO2
Compute the longitudinal tensile strength of an aligned glass fi Compute the longitudinal tensile strength of an aligned glass fiber-epoxy matrix composite in which the average fiber diameter and length are 0.010 mm (4 ( 10-4 in.) and 2.5 mm (0.10 in.), respectively, and the volume fraction of fibers is 0.40. Assume that (1) the […]
Compute the elastic moduli for the following polymers, whose str Compute the elastic moduli for the following polymers, whose stress-strain behaviors may be observed in the ?oTensile Tests?? module of Virtual Materials Science and Engineering (VMSE): (a) High-density polyethylene, (b) Nylon, and (c) Phenol-formaldehyde (bakelite). How do these values compare with those presented in Table […]
Compute the elastic moduli for the following metal alloys, whose Compute the elastic moduli for the following metal alloys, whose stress-strain behaviors may be observed in the ?oTensile Tests?? module of Virtual Materials Science and Engineering (VMSE): (a) Titanium (b) Tempered steel (c) Aluminum and (d) Tarbon steel. How do these values compare with those […]
Calculate the room-temperature electrical conductivity of silico Calculate the room-temperature electrical conductivity of silicon that has been doped with 2 A? 1023 mâ3 of arsenic atoms.