DoITPoMS

Questions

Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

1. In Fick’s 1st Law, is J (the flux of atoms) proportional to;

   	a	the square root of time
   	b	the concentration gradient
   	c	the rate of change of the concentration gradient
   	d	the energy barrier Q

2. Which of these diffusion mechanisms is NOT observed?

   	a	Vacancy
   	b	Ring
   	c	Interstitial

3. What is Fick’s 2nd Law?

   	a
   	b
   	c

4. What happens to the diffusivity of a material as you increase the temperature?

   	a	It decreases linearly
   	b	It increases linearly
   	c	It decreases exponentially
   	d	It increases exponentially