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- Q4 )A silicon wafer is doped with 10^21 phosphorus atoms / m^3. Find the carrier concentration and fermi level at room temperature ( 300 k ) Nc = 2.8* 10^25 m^-3 and ni = 1.5 * 10^16 m^-3.This is surface science.With the aid of sketches, explain the solidification of Fe-Al alloy from liquid to final microstructure present at room temperature. Determine the phase present, their individual composition, and the phase fraction at 250°C.
- 2. What is the distinction between matrix and dispersed phases in a composite material?3. True or False. a. The relation d In P / dT = AvapH / RT² should not be applied to solid-liquid transitions. b. The relation d In P / dT AvapH / RT² should be applied to liquid-vapor transitions. c. The relation d In P / dT - AvapH / RT² should be applied near the critical point. 4. Some vapor pressures of a certain substance are the following: Temp (°C) Р (Torr) 1227 1327 1427 1527 1627 19.72 48.48 107.2 217.7 408.2 Generate the equation of the best-fit line from a plot of ln P (Torr) vs. 1/T. b. Find the average AvapH over this temperature range. c. Estimate the liquid's normal boiling point. а. 5. The sublimation pressure of CO2 is 138.85 K and 158.75 K is 1.33x10-3 bar and 2.66x10-2 bar, respectively. Estimate the molar enthalpy of sublimation of CO2.The layer thicknesses are L1, L2 = 0.6L1, and L3 = 0.5L1. The thermal conductivities are k1, k2=0.6k1 and k3= 0.9k1. The temperatures at the left side and right side of the wall are TH=30OC and TC= -15OC, respectively. Thermal conduction is steady.What is the temperature difference ΔT2 across layer 2(between the left and right sides of the layer)?
- define phase chaneg and calculate the amount of each phase present in 15 kg of 60 wt% Pb-40 wt% Sn alloy at 200 degree C.The time of efflux of water through an Ostwald viscometer is 0.60 minutes. For the same volume of an organic liquid of density 1.75 g/ml the time is 1.25 minutes. Find its absolute viscosity at 20° C is 1 cP.. An internal friction peak caused by interstitial diffusion in a bcc metal has its peak at 50° C at a frequency of 0.70 Hz. When the frequency is changed to 2.81 Hz the peak is shifted to 64° C. (a) Calculate Q for the process. (b) If the lattice parameter is 3.2 x 10 cm, calculate D at 100° C and D..
- - & Sketch New · C $ 7 ♡ www 1500 kg/m³ O 3000 kg/m³ 5000 kg/m³ 7000 kg/m³ 9000 kg/m³ 44 < HD E Material X has an atomic radius R = 0.125 nm, an atomic weight of A = 51 g/mol, and a body centered cubic (BCC) crystal structure. Calculate the mass density of this material. Hint: Do your calculations in SI units, as this will help avoid numerical errors from unit conversions. Choose the answer closest to your calculated value.η helium = 1.88 x 10-5 Pa s at 0 C, calculate the diffusion coefficient and the thermal conductivity coefficient.2. A spherical metallic nanoparticle of diameter di = 100 nm melts at Tmi = 900 K. A smaller spherical nanoparticle of the same metal, of diameter dz = 50 nm, melts at Tm2 = 800 K. a) Explain why the smaller nanoparticle melts at a lower temperature. b) Calculate the melting point of the metal in bulk form.