Physics 320: Modern Physics

Instructor: Sarah Yost, PENGL113
Class Hours:

2-4-6
9:40-10:50
PENGL 167

Office Hours:
9:00-9:20
1-3-5: between the 9:40 and 11:20 classes and at 1:00
2-4-6: 11:00

I'm also generally just around with my door open. Please drop by, or email me if you want to set a time.

Course Notes

This is where we depart from ``everyday'' classical physics to ``modern'' physics. There are two major areas where classical rules break down: at fast speeds and extreme length scales. Classical physics is not ``wrong'': it's the (extremely useful!) limit of the more general rules at ordinary sizes and speeds.

In this course we will attack physics when the speed approaches that of light (Special Relativity) and when the sizes of objects involved is small, often subatomic (Quantum Physics and the wavefunction). There are problems with using classical physics at enormous length scales -- at the Gigalightyear level -- but that is a more advanced topic to be attacked with General Relativity. In both cases, we will be reexamining just what it means to measure something. In Relativity, measurement requires that objects lengths and intervals of time between events actually differ depending upon the speed of the measurer relative to what is being measured. In Quantum Physics, an object may not have a definite property until it is measured, and we deal with the important concept of expectation values to constrain what we could observe once we decide to measure something.

Text: "Concepts of Modern Physics" by Arthur Beiser
There is a hardcover and a paperback edition, which are supposed to have exactly the same page content.

# ISBN-10: 0072448482
# ISBN-13: 978-0072448481
(N American edition)

ISBN: 007115096X
ISBN-13: 9780071150965
(International edition)

Grading:

Anticipated Grade Scale:

Grade	Percentage	
A	93
B	80
C	67
D	50
F       < 50
Mid-letter grades may not be precisely halfway between letter grades. I may modify the scale, but only in your favor.

Details in the syllabus

Academic Honesty

CSBSJU's academic catalog defines plagiarism as ...the act of appropriating and using the ideas, writings, or works of original expressions of another person as one's own without giving credit to the person who created the work. If suspected, the burden of proof rests with the faculty. If proven, the consequence for a first offense is failure of the course.

Again, please note that it is quite helpful to work in groups at times to solve homework problems, and this collective effort is NOT plagiarism. You may be asked to explain something, however, and you must find a way to say it in your own words.

Any unauthorized use of solution guides (particularly ``Instructor's Guides'') constitutes academic dishonesty. Presenting work assisted by such items is plagiarism.

Homework Assignments

Your homework is a form of practice and study. This study is not complete when you hand in or get back the homework set. You are expected to check over and re-try problems which you found difficult or were not able to solve. This should be done as soon as possible in order to clarify concepts which will be used later in the course. Reading a solution helps with this process, but it is no substitute for redoing a problem. Solutions are emailed in PDF format. Please let me know if you have trouble receiving them.

Test Information

Test times will be announced as we reach the end of a unit (see the syllabus). Last year, the tests were in very early february, halfway through March, and a week into April. You will be given equation sheets. Last year's may give you an idea of what we will cover:

Test 1 Equation Sheet
Test 2 Equation Sheet
Test 3 Equation Sheet
Final Equation Sheet