Question

Which of the following is not a factor that affects atomic transport?
a. concentration gradient
b. atomic radii
c. jump distance, Δx
d. temperature

Which is the equation pertaining to steady state diffusion?
a. Hall-Petch Equation b. Fick’s first law c. Fick’s second law d. Fick’s third law

Duralumin is an age-hardening aluminium-copper alloy once used in airships. Duralumin gains strength because copper in the alloy becomes less soluble at lower temperatures. Which of the following explains the behaviour of Duralumin?
a. Grain Refinement
b. Strain Hardening
c. Precipitation Hardening

Which of the above elements is least likely to form a substitutional solid solution in Fe according to the Hume-Rothery Rules?
a. Co
b. Ni
c. Mn
d. Mo

Answer 1

Answer:

Factor that not affects atomic transport:

Answer:(C)

Explanation:

Tempearture enhances the Atomic transport because the Kinetic energy increases between the molecules. The Concentration and atomic radii decreases the atomic transport because of inertia between the molecules.

Steady state diffusion:

Answer: (b)

Explanation:

It relates the diffusive flux to the concentration under the assumption of steady state. It explaines that the flux goes from regions of high concentration to regions of low concentration, with a magnitude that is proportional to the concentration gradient.