Flux of hydrogen through the foil in the previous problem is

Flux of hydrogen through the foil in the previous problem is 0.33 times 10^8 H atoms/cm^2 0.33 times 10^8 H atoms/cm^2 s 0.33 times 10^8 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 1065 J/mol 1.87 times 10^5 J/mol 2.87 times 10^5 J/mol Which one of the following statement is correct? Activation energy is higher in grain boundary diffusion compared to that of volume diffusion Activation energy is higher in surface diffusion compared to that of volume diffusion Activation energy is higher in grain boundary diffusion compared to that of surface diffusion Activation energy is lowest in surface diffusion followed by grain boundary diffusion and volume diffusion. Given the following data from a tensile test answer questions 11-16 The following data were collected from a 12-mm-diameter test specimen of magnesium (= 30.00 mm): After fracture, the gage length is 32.61 mm and the diameter is 11.74 mm.

Solution

8.B

9.A

10.D