Homework SourseYou are given in the figure below for a 7030 CuZn brass allo
You are given in the figure below for a 70/30 Cu/Zn brass alloy. Based on this data, what yield strength would you expect for a perfectly crystalline sample? 25 Mpa 50 Mpa 100 Mpa 150 Mpa 200 Mpa Which of the following factors affects the magnitude of the diffusion coefficient? Chemical identity of the diffusing species. Chemical identity of the host lattice. Temperature All of the above None of the above
Solution
10) D-All of the above-----The diffusion coefficient of a molecule is a much more reliable guide to the aparent molecular weight and tertiary structure than NMR relaxation time or line width measurements, especially in absence of resonance assignments. The Stokes-Einstein relation relates the Diffusion coefficient, D, of a particle to its molecular shape via a friction coeficient f
D=kT/f
where T is the temperature and k is the Boltzmann constant. In the case of a sphere,
f=6*PI*RD
where RD is the effective hydrodynamic radius.
Factors affecting the diffusion coefficient:
