Fick\'s first law involves Concentration gradient, activation energy, temperatur
ID: 2323869 • Letter: F
Question
Fick's first law involves Concentration gradient, activation energy, temperature and time Concentration gradient, activation energy, temperature Concentration gradient and activation energy None of the above If the element is bonded to B element at an elevated temperature, the A atoms diffuse faster into the B than B atoms diffuse into a element. Consequently interface location Moves towards a element side moves toward B element side Remains uncharged First moves toword A then B side Diffusion coefficient of C in steel at 500 degree C is 2.97 times 10^-7 cm^2/s 1.4 times 10^-8 cm^2/s 2.838 times 10^- cm^2/s 5.16 times 10^-7 cm^2/s A carburizing process is carried out on a 0.1% C steel by introducing 1% C at the surface at 800 degree C. What is the carburization time if the carbon content at 0.2 cm beneath the surface is 0.456% (Diffusivity of C in steel at 800 degree C is 6 times 10^-7 cm^2/s) 92.6 h 12.9 h 1186 h 161.8 h A 0.001 in BCC iron foil is used to separate a high hydrogen content gas from a low hydrogen content gas at 650 degree C. 5 times 10^8 H atoms/cm^3 are in equilibrium on one side of the foil, and 2 times 10^2 H atoms/cm^3 are in equilibrium with the other side. Determine the concentration gradient of hydrogen through the foil. -1968 times 10^8 H atoms/cm^3 cm -4.99 times 10^11 H atoms/cm^3 cm -4.99 times 10^11 cm^2/s 0.33 times 10^8 cm^2/atoms Following data is obtained for diffusion-controlled process. The activation energy for the process is 68, 628 J/mol 0.87 times 10^5 J/mol 1.87 times 10^5 J/mol 2.87 times 1065 J/molExplanation / Answer
23.C
24.D
25.B
26.A
27.D
28.A
29.A
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