(Don't Use Canvas to contact me, use email link)
Office: LD 156-S, 278-9244
Class: LE 101, Tu,Th 10:30 - 11:45
http://woodahl.physics.iupui.edu
Is the University open/closed today?
Review all your notes following the Exam 1 material
Use the Study Guide to help organize the various topics
Exam details have been announced on Canvas
4 questions, multiple choice, review your notes from the last four lectures
Tuesday's lecture will be via Zoom, details will be announced later on Canvas
Spiral Structure of Milky Way Galaxy -- possibly a "Barred-Spiral"
This ends Exam 2 material
Video Lecture on Thursday (April 2), watch the three lecture videos below (at your convenience)
No Zoom lecture for Thursday (April 2)
This material will be on the Final (not Exam 2)
A Globular Cluster in Milky Way: Omega Centauri (NGC5139), Visible by Unaided Eye
LSS of Universe: Clusters & Superclusters that Neighbor the Milky Way (Near-Infrared Frequencies)
4 questions, multiple choice, review your notes from the last two lectures
General Relativity Allows for Wormhole Solutions for Faster than Light Travel
"Back To The Past": General Relativity Allows for Wormhole Solutions for Time Travel
Edwin Hubble: Determined M31 Was a Galaxy 2 Million Light-Years Away
Dark Matter (Imagine that the green/yellow/orange strands are dark and you cannot see them.)
4 questions, multiple choice, review your notes from the last three lectures
4 questions, multiple choice, review your notes from the last lecture
No classroom lecture on Thursday (2/27), watch the three 20 min. lecture videos below
Recombination Photons During Helium Shell Flashes: Double-Shell Red Giant
Death of a High-Mass Star: Supernova (Crab Nebula Produced in 1054 AD)
The correct way to determine your current numerical grade (right now) is to convert your score on Exam 1 and the four quizzes into percentages and apply the weighting: Take your quizzes and compute the average (e.g. say it is 3.25), divide that number by 4 and then multiply by 100% (e.g. 3.25/4 x 100% = 81.25%). Next, take Exam 1 raw score and divide by 65 and then multiply by 100%. Now we must apply the weighting. In the end, exams will be 75% or your score and quizzes will be 25%. So we need to apply this weighting. Take your quiz percentage (e.g, 81.25) and multiply by 0.25. Then take your Exam 1 percentage score and multiply by 0.75. Add those two results and that is your current numerical score in the class (with the correct weighting). For a score from 90 to 100, that is an A, and the 80 to 89 is the B range and so on. If you want to get technical, A- is 90 to 93, B+ is 87 to 89, and so on. Now if you want to get super technical, I have an undisclosed big curve for the C range, a moderate curve for the B range, and a very tiny little curve for the A range. Thus what you compute, is actually the "worst case" scenario for your grade.
Scores have been posted on Canvas. Average was 49 out of 65 (75%).
An Interstellar Medium Containing Carbon Monoxide (Radio Frequencies)
Atmospheric Scattering of Light: Blue Daytime Skies and Red Dawn
65 questions, multiple choice, review all your notes
Rememberize to bring a #2 pencil
''.. I brought my pencil, gimme something to write on, man ..'' OpScan sheets will be provided, pick one up when you enter
4 questions, multiple choice, review your notes from the last four lectures
Absolute Brightness or Luminosity Versus Apparent Brightness
Traditional H-R Diagram with the Absolute Magnitude Scale (on right-hand side)
The Red SuperGiant Betelgeuse (Hubble): Diameter is Larger than Jupiter's Orbit Around the Sun
4 questions, multiple choice, review your notes from the last FOUR lectures
Stars with Higher Surface Temperatures Emit Mostly Shorter Wavelengths
Mass Information from Doppler Shift of Spectra from a Binary Star System
4 questions, multiple choice, review your notes from the past two weeks
In particular, look over proton-proton chain and the four forces -- notably gravity (binds mass) and electromagnetic (binds electric charges)
Einstein (in 1904): Speed Of Light is the "Speed Limit of Our Universe"
Visible Light is a Small Part of the Entire Electromagnetic Spectrum
Isaac Newton (in 1670): White Light Contains All the Visible Colors (Visible Frequencies)
James Maxwell (in 1860): Father of the Famous Maxwell Equations Governing the Behavior of Light
Niels Bohr (sitting with Einstein): Architect of Modern Theory of Atomic Physics
Photon (wavy line) Being Absorbed by Atom -> Electron (solid blue line) Jumps Up into Higher Orbit
Atom Emitting a Photon (wavy line) -> Electron (solid blue line) Jumps Down into Lower Orbit
4 questions, multiple choice, review your notes from last week's two lectures
Know: temperature scales: Kelvin (absolute), Fahrenheit, Celsius; Galileo (first to watch sunspots -- rotation rate); multiplying large numbers; and temperature of the Sun at various locations
The 4 Fundamental Forces Occur Only at Moderately Low Temperatures
Sun's Proton-Proton Chain Fusion Reaction (4 Protons Produce Helium + Energy)
Ray Davis, 2002 Nobel Prize in Physics for the Detection of Cosmic Neutrinos During 1960's
Quarks Fundamental Particles, Three Quarks in Every Proton and Neutron
I post this early, just to keep it on everybody's radar screen: 5 Bonus Points are available to all students if the following condition is met: 80% class participation in filling out the official IUPUI Online Course Evaluation (near the end of semester).
Astronomy, the Oldest of the Sciences, 5000 Years Old: Stonehenge
Approaching Modernity: Galileo Galilei's 1610 AD Notebook Page (Who Needs Computers?)
Magnetic Field Lines "Trap" Moving Charged Particles (Thus They Spiral)
Coronal Mass Ejection (Orange Disc is Photosphere, Red Disc is Chromosphere, X-Ray Photography)
Syllabus (PDF). Please print and keep with your notes.
Master Schedule (PDF). Please print and keep with your notes.
These documents will likely change/update throughout the semester. Please check that you have the latest versions.
Check here ( http://woodahl.physics.iupui.edu/Astro105/ ) for the latest information regarding our particular class cancellation(s)
Weather related cancellations will be announced on this page -- Please do not email me asking if class has/will be cancelled
Many thanks to Ryan Bertram (Astro A100 student), who introduced me to this neat YouTube video (courtesy of Rob Bryanton, Canadian author) that discusses the ten possible dimensions of our universe.
Many thanks to Tim McCormick (Astro A100 student), who introduced me to this fantistic webpage that models early solar system formation.
Many thanks to Elizabeth Potter (Astro A105 student), who showed me this neat webpage highlighting the relative sizes from the Local Group down to Quarks (and the corresponding orders of magnitude, or powers of ten)
Department of Physics, IUPUI - Updated on March 15, 2020 at 10:05 PM EDT
