Today was the “final exam” period for both my AP Physics 2 classes. Since we already completed our final exam, we watched a couple episodes of Brian Greene’s The Fabric of the Cosmos. The “Quantum Leap” episode covered a couple of new topics that were interesting and the “Universe of Multiverse?” episode is a nice “way out there” note on which to end the year.
I’m glad I managed to finish the 180 (well, 170) blog for AP Physics 2. I hope other have found this useful and I’m sure I’ll refer back to it next year. I’m not sure if I’ll do a 180 blog next year or not. If I do, I’m not sure what focus or theme is will have…. Something to reflect on over the summer.
I’ve watched a lot of videos about cosmology. The best that I’ve found to wrap up our cosmology unit is a 2009 talk by Lawrence Krauss at his Origins Symposium. (It appears the video is currently unavailable on this web site.) He does a great job covering the progress of cosmology from Hubble through dark energy in an accessible manner.
Today we discussed the history of our discovery of the cosmic microwave background radiation and how precisely we can now measure it with the Planck satellite. From this, we discussed how the theory of inflation may answer questions that the Big Bang theory doesn’t address. Last year, we focused a lot on the BICEP2 experiment and gravitational waves. Not so much this year….
Today, we discussed the results from the Hubble’s Law lab and continued with our discussion of cosmology. We focused on Dark Matter and the work of Vera Rubin, Frank Zwicky, and Peebles and Ostriker. Here a student tries an analogy for gravitational lensing by looking at a projected grid and a dot though a wine glass. As you move the wine glass, the grid is distorted. Held in the center, the dot becomes a ring, much like gravitational lensing of galaxies.
The juniors in AP Physics 2 spent two days working through a fantastic Hubble’s Law lab from the University of Washington. I’ve explored a lot of Hubble’s Law labs, and this one is my favorite. It is the most authentic because students use actual images to calculate the distance to the galaxies and spectrum data to calculate the relative velocities.
Today we had short class periods due to the senior awards assembly. There was just enough time to introduce Hubble’s Law and how we can determine the age of the observable universe by measuring the distance and velocity of galaxies relative to us.
Tonight was graduation. Congratulations to the Class of 2015!
Today was the last day with all of the seniors in my AP Physics 2 class. Near the end of each school year, I take a day and share with them my experience working at Fermilab in the summer of 2011 on the Holometer experiment – my adventure exploring the smallest intervals of space and time and preparing to explain it to high school students. Most students find the idea of the holographic principle fascinating and the Holometer experiment very interesting. I share photos, stories, and diagrams. I share with them my passion for this experiment and how it is an amazing combination of theoretical physics, experimental physics, engineering, and software. Afterward, I share with them a series of posts I wrote about the Holometer and Holographic Principle as part of my summer work. I also have created an Evernote notebook of articles and videos.