(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?
Exam 3 on Thursday, May 7th from 10:30 AM to 11:30 AM
Review all your notes following the Exam 2 material
Use the Study Guide to help organize the various topics
Our last lecture is Thursday, April 30
Lectures will be via Zoom
Lectures will be via Zoom
Spectrum of Microwave Radiation Closely Matches Big Bang Theory
"High-Tech" Big Bang Detector in Your Home: Snowy Channel on an Antenna-Fed TV (1% is CMBR)
Gravity: Binds Objects with Mass (Motorcycle's Front Wheel Overcomes Gravity)
Electromagnetic: Binds Electrons to Protons to Form Atoms (Beryllium Atom)
Strong: Binds Quarks to Form Protons, Neutrons, and Nuclei (Helium Nucleus)
Scores have been posted on Canvas. Average was 25 out of 30 (84%).
Take all your quizzes, drop the lowest score, 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%), this is your quiz average percentage. Next, take Exam 1 raw score and divide by 65 and then multiply by 100%. Then take the Exam 2 raw score and divide by 30 and then multiply by 100%. Take both exam scores, add them, and divide by 2 (this will be your exam average percentage). Now we apply the weighting. Exams count for 75% of your score and quizzes count for 25%. Take your quiz average percentage (e.g, 81.25) and multiply by 0.25. Then take your exam average percentage and multiply by 0.75. Add those two results and that is your current numerical score in the class. 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.
On a single 8.5" x 11" sheet of paper, in approximately 200 words, TYPED, explain in your own words the "Unruh Effect" and its connection to the temperature of a black hole. Make sure you include your full name (upper righthand corner), email it to me directly: bwoodahl@iupui.edu. The due date is 11:59 PM on Thursday April 23rd (late submittals are not accepted).
Final Exam on Thursday, May 7th from 10:30 AM to 11:30 AM
Final Exam is NOT comprehensive, hence let's call it "Exam 3"
We have three weeks of (remaining) lectures. Our last lecture is Thursday April 30th.
Lectures will be via Zoom
Gamma-Ray Short-Burst: Collision Involving Neutron Stars & Black Holes
Evidence for Big Bang Theory: Penzias and Wilson and their Microwave Antenna
Watch the three lecture videos below on Quasars (at your convenience)
No Zoom lecture for Thursday (April 9)
The Jets of Cygnus A (color enhanced, microwave frequencies)
Looking for Quasars and Radio Galaxies: Australia's Telescope Compact Array (ATCA)
Massive Star Collapses Forming Black Hole: Jets Along Rotation Axis Produce Gamma-Ray Long-Burst
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 have been posted 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 April 23, 2020 at 3:05 PM EDT