Modern Physics - 301 Test 2 Review Sheet

Disclaimer: This sheet is in no way supposed to be an absolute guide to everything that will be covered on this test (i.e. I probably forgot something). Any specific omissions you notice should be brought to my attention immediately.

Format: The format of this test will be similar to test 1. It will consist of problems (perhaps two-thirds of the test) and thought questions. The later might take the form of short answer, explanations, descriptions, whatever!

Suggestions: Review the homework, class notes, and text. Practice by answering the questions at the end of the chapter and solving some problems not assigned for homework. Online are last year’s test and chapter quizzes. It is required that you always start from the simplest equations. I have found that it is almost always better to solve problems in terms of known variables and then substitute any given numbers.

What is covered:

Chapter 27, sections 1-4, 10-12, and 28.09, plus other material covered in class and lab.

Ideas from introductory physics that you need to understand (did I miss any?):

Conservation of Energy (Ei = Ef)

Conservation of Momentum (pbefore = pafter)

Frequency and Wavelength (lf = c for a light wave)

Energy measured in electron volts (1 eV º 1.6 ´ 10-19 J)

Basic ideas of constructive and destructive interference of waves

New concepts you should understand:

Spectroscopy

Fraunhofer lines / Joseph Fraunhofer

Balmer Series (and the other series) / Johann Balmer

Rydberg Equation / J.R. Rydberg

X Rays and X-Ray Diffraction / Wilhelm Röntgen, WH WL Bragg

Discovery of the Electron / Joseph John Thomson

Blackbody Radiation

Wien Displacement Law / Wilhelm Wien

The Ultraviolet Catastrophe / Physicists unhappy

Planck's Hypothesis / Max Planck

The Photoelectric Effect / Albert Einstein

Basic concepts in Radioactivity / Henri Becquerel, P. and M. Curie

Discovery of the Nucleus / Ernest Rutherford + helpers

The Bohr Atom / Neils Bohr

Successes of the Bohr Atom / Many and various (esp. Moseley)!

Equations I'll give you:

I'll give you all constants you need (except h and c), but I might not tell you the units. For example:

e = 1.60 ´ 10-19 C k = 2.90 ´ 10-3 K m

1 eV = 1.60 ´ 10-19 J k = 1/4pe0 = 8.99 ´ 109


R = 1.097 ´ 107 E0 = 13.6 a0 = 0.053