Wednesday

October 1, 2014

October 1, 2014

Posted by **drifting** on Wednesday, December 2, 2009 at 3:45am.

c(r, t) = [n/8(pi D t)^(3/2)] e^(-r^2 /4 D t)

where r^2 = x^2 + y^2 + z^2 with x, y, and z being the values of three components of the position in the Cartesian coordinate system.

a) Show that the above distribution satisfies the following three dimensional diffusion equation:

(partial/partial t)c(r,t) = D (partial^2 / partial x^2 + partial^2 / partial y^2 + partial^2 / partial z^2) c(r, t)

b) Find out the expression for average distance <r> as a function of time, where <...> means average over c(r, t)

c) Find out the experession for average mean-square distance <r^2>

**Answer this Question**

**Related Questions**

chemistry help asap??? - Why is boiling-point elevation a colligative property? ...

chemistry - a. Find the amount of solute based on this information Volume = 500 ...

chemistry - a. Find the amount of solute based on this information Volume = 500 ...

Chemistry - When 3.15 g of a nonelectrolyte solute is dissolved in water to make...

Chemistry - When 3.10 g of a nonelectrolyte solute is dissolved in water to make...

Chemistry - When 4.54 g of a nonelectrolyte solute is dissolved in 565 mL of ...

Chemistry - When 4.73 g of a nonelectrolyte solute is dissolved in 965 mL of ...

AP Chem. - NaCl dissociates completely in water. Therefor the total number of ...

Chemistry - When 50 mL of 1.0 M AgNO3 is added to 50 mL of 0.50 M HCl, a ...

chemistry - Which of the following is NOT true for solutes and solvents? A. At ...