Question

Question 3 2 pts Select all statements that are true with respect to steady and non steady-state diffusion. Self-diffusion of Fe is slower than diffusion of Cin Fe In non steady-state diffusion, diffusion flux into the system is equal to diffusion flux out. Self-diffusion can be monitored by use of radioactive isotopes High density materials will have faster diffusion than low density materials Concentration gradient is a driving force for diffusion

Answer 1

a. False

Because in self diffusion only similar molecules like Fe are going to create obstructions in their mean free path. But, in a mixture of Fe & C particles definitely the diffusion of Fe is less, due to the mean free path is low for the particles

b. False

In steady state system The diffusion flux in = Diffusion flux out (Because there is no accumulation in steady state system). In non-steady state system diffusion flux in = Diffusion flux out + Accumulation

c. True

Self-diffusion may be monitored by using radioactive isotopes of the metal being studied

d. False

Because high density materials have high molecular weight, so due to weight the can move slowly in diffusion process

e. True

For mass-Transfer to be happen driving force must be concentration difference.