# Statistical Physics

1. Apr 1, 2005

### Palindrom

Hi all.

So something's bothering me;

Given the def. S=-k(sum on r: pr*ln(pr)) for the entropy, find the entropy of N>>1 free particles moving in a 2d box with energy E.

Now, don't I have a continuum of states here? How do I do that?

Thanks

2. Apr 1, 2005

### dextercioby

Use the quantum canonical ensemble...Compute the partition function and then the entropy.

Doesn't mention anything about the temp...Could it be the microcanonical ensemble...?

Daniel.

3. Apr 1, 2005

### Palindrom

Hum... you've kinda just given me a dizzy head...

It's only my second week of statistical mechanics, so consider that.

And... I might not recognize some of the terms in English. What's a partition function?

Sorry

4. Apr 1, 2005

### dextercioby

The problem is weird,as it doesn't mention about the volume of the box,nor the temperature.That would mean the microcanonical ensemble,but again i can't see a way to compute the eigenvalues of the density operator.

Daniel.

5. Apr 1, 2005

### Palindrom

What density? Of states?
Weird anyway... I'll keep thinking about it.