Recent content by henxan

Assuming D>>t it would probably be a fairly accurate description of the situation for small ##\theta##. If it was me, I would place the glass on the entry-side of the slit, thus avoiding such inconsistencies.

I would strongly suggest that you draw your problems - actually mostly so you can visualize the problems better. :).. On conducting surface, the charge distributes evenly on the entire surface, so ##\rho = \frac{q}{A_{tot}}##. If there is only a slight difference in the answer, try including...

So, doesn't the sheet have two sides?

## A = 0.19\cdot0.19~m^2 = 0.0361~m^2## right?

I think you need to read my previous reply a bit more careful ;).. Both 1. and 2. Has to be fulfilled.. Also, your statement about stability, are both correct? Remember, higher binding energy ##\rightarrow## more stable.

After you get your x-axis straightened out you can imagine the that the function ##a\cdot e^{\frac{b}{T}} ## is a model that describes how your graph works. It can be extended in both directions. If you go to the right ##\frac{1}{T}## increases - which in turn corresponds to a decrease in T, and...

1. Radioactive decay is the process fission. What will this do with the number of nucleons? Your answer to this should tell you which way any likely reaction would go, either: S ##\rightarrow## R and Q ##\rightarrow## P. S ##\leftarrow## R and Q ##\leftarrow## P. 2. To achieve a more stable...

Thanks for your replies! I was aware of the method you describe Chestmiller, though I wanted to see if I could make the "shell method work". However, it seemed like this method required such enormous amount of cells to calculate correct, so I went for the solution you described Chet. Thus...

Well, as I have understood it, the analytical solution above, gives the concentration profile from the sphere surface. It does not tell me what the radius of the sphere is, but it tells me what the diffusion profile is at the surfae and at distances from the sphere surface. Am I wrong - and is...

The problem we are dealing with is that of diffusion controlled dissolution of a solid. The solid has a concentration (typically set to 1) while the concentration at the liquid solid interface is a fraction of that This is illustrated in the following image (From On The Kinteics of Precipitate...

Hi! Thanks for the reply! My row elements are from ##r=0## with step ##\Delta r## to max size of ##r##. So, at column one: ##r_1=0## and ##C_i = C_{int} = 0.0025## for all elements. Hope this was answer to what you were wondering about.

The problem statement Based on an analytical solution for the concentration profile of a dissolving sphere, I am supposed to use a numerical method to find the time at which the sphere has fully dissolved. This is not so much a question about specific values - but about the technique by which I...

What I maybe should have written is, "How do I expand the following matrix expressions to calculate: \Delta u_i^{n+1} = \begin{pmatrix} D_{i-1}^{n} & D_{i}^{n} & D_{i+1}^{n} \end{pmatrix} \begin{pmatrix} 1 & -1 & 0\\ 1 & -2 & 1\\ 0 & -1 & 1 \end{pmatrix} \begin{pmatrix} u_{i-1}^{n} \\ u_{i}^{n}...

I am going to do a numerical simulation of diffusion in matlab. The diffusion coefficient is concentration dependent, and i use an array operation to calculate D(x), so it is known. Based on Fick's second equation: $$ \frac{\partial C}{\partial t} = \frac{\partial}{\partial x} D \frac{\partial...

Thanks for answering! :).. Yes, that was partially what I was wondering about, the cutoff wavelength :)..