## PHYS 317 Reading Assignment #5

Read section 2.2 and 2.3 and answer the following questions by email, hardcopy, or web form before class Wednesday, September 10.

**How many oscillators are there in an Einstein solid with 2000 atoms?**
Each atom is really 3 oscillators, so there are 6000 oscillators.
(And while we could study any number N of oscillators, only N's divisible by
3 are physically meaningful.)

**What is the multiplicity for 3 oscillators with 4 units of energy? **Using q=4 and N=3 in equation (2.9) gives 6!/(4! 2!) = 5*6/2 = 15

**What does the second law of thermodynamics mean in terms of multiplicity? **
Essentially, if you prepare a system in a macrostate with a relatively
low multiplicity, it will tend to move to a macrostate of relatively high
multiplicity.

**What is the fundamental assumption of statistical mechanics? **
That all microstates (of an isolated system in thermal equilibrium)
are equally likely.

**Was there anything you had particular difficulty with in this reading? Is so, describe briefly. **

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