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Physics 416: WarmUp Exercises

...Counting States

This assignment is due before 10 AM, Friday, January 28th, 2000.

Please type LAST name:

Please type your LAST NAME and LAST FOUR SS# digits (eg: Smith3256):

I received no help from anyone on this assignment.

The following questions refer to the material you were to read in preparation to the lesson. Each question requires you to write a paragraph or two in response.

You may change your mind as often as you wish. When you are satisfied with your responses, click the "Submit WarmUp" button at the bottom of this page.




1.


What is the "Density of states" (E)? Please explain how it differs from (E), and why it is useful. Also, please explain the function (E). These are all discussed in section 2.5 of Reif.



2.

Suppose you have a system that consists of 100 spin 1/2 particles. Estimate the number of states in which half of the spins are up and half are down. Also, estimate how rapidly this number changes if the number of up spins changes by a small amount.





Below is a space for your thoughts, including general comments about today's assignment. What was hard or confusing (or cool)? What would you like to spend extra time on in class? Do you see how this subject fits in with the others we have discussed?




You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.

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