Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Midterm Exam 1 for Thermal Physics | PHYS 224, Exams of Thermal Physics

University of Washington (UW) - SeattleThermal Physics
Prof. David Cobden

Material Type: Exam; Professor: Cobden; Class: THERMAL PHYSICS; Subject: Physics; University: University of Washington - Seattle; Term: Autumn 2007;

Typology: Exams

Pre 2010

Uploaded on 03/18/2009

koofers-user-njr
koofers-user-njr 🇺🇸

3.5

(2)

10 documents

1 / 4

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Page 1 Name _______________________________
Thermal Physics 224 First midterm 9.30 am, Wednesday October 31, 2007
Autumn 2007 Instructor: David Cobden
Do not turn this page until the buzzer goes at 9.30. You must hand your exam to
me by the time I leave the room at 10.25.
Attempt all the questions.
Please write your name on every page and your SID on the first page.
Write all your working on these question sheets. Use this front page for extra working. It is important
to show your calculation or derivation. Some of the marks are given for showing clear and accurate
working and reasoning.
Watch the blackboard for corrections or clarifications during the exam.
This is a closed book exam. No books, notes or calculators allowed.
pf3
pf4

Partial preview of the text

Download Midterm Exam 1 for Thermal Physics | PHYS 224 and more Exams Thermal Physics in PDF only on Docsity!

Thermal Physics 224 First midterm 9.30 am, Wednesday October 31, 2007 Autumn 2007 Instructor: David Cobden

Do not turn this page until the buzzer goes at 9.30. You must hand your exam to me by the time I leave the room at 10.25.

Attempt all the questions.

Please write your name on every page and your SID on the first page.

Write all your working on these question sheets. Use this front page for extra working. It is important to show your calculation or derivation. Some of the marks are given for showing clear and accurate working and reasoning.

Watch the blackboard for corrections or clarifications during the exam.

This is a closed book exam. No books, notes or calculators allowed.

  1. [4] State the equipartition theorem.
  2. [10] Find an expression for the root mean square speed ݒ௥௠௦ of a dust particle of mass m suspended in air at temperature T.
  3. [6] Find an approximate expression for the root mean square angular velocity ω (^) ୰୫ୱ of the dust particle if its radius is approximately r.
  4. [8] In the course of pumping up a bicycle tire, a volume V 0 of air at atmospheric pressure p 0 is compressed adiabatically to a pressure p 1. Sketch the process on a p-V diagram, indicating also some isotherms. Assume air is an ideal gas.
  5. [8] What is the final volume V 1 of this air after compression? Use ߛൌ 1 ൅ 2/݂ , where f has its usual meaning, and the fact that air is mostly diatomic nitrogen and oxygen.
  1. [4] State the Second Law of Thermodynamics.

12. [6] Show from the definition of entropy S in terms of multiplicity Ω that it is an extensive quantity.

  1. [5] Consider a two-state paramagnet with N dipoles of which q point up. Assume that the paramagnet is completely isolated and the magnetic field is zero, so there is no energy difference between up and down spins. The problem is equivalent to that of finding q pennies with their heads up

in a box of N. What is Ω for the macrostate specified by q?

  1. [4] What is the most probable value of q , assuming that all microstates are equally likely?
  2. [10] Use this, and Stirling’s approximation (݉! ൎ ݉ ݉െ ݉ln ) to find a simple expression for the entropy of the paramagnet when N is large. Demonstrate that it is indeed extensive for this system.