The big physics-y news story of the moment is the trapping of antihydrogen by the ALPHA collaboration at CERN. The article itself is paywalled, because this is Nature, but one of the press offices at one of the institutions involved was kind enough to send me an advance version of the article. This seems like… Continue reading Trapped Antihydrogen
Category: Physics
Writing Relativity vs. Writing Quantum
Fall term classes ended yesterday, officially– my last class was Friday– so I’m shifting over to spend more time working on the sequel to How to Teach Physics to Your Dog, which involves talking to Emmy about relativity. Progress has been slower than last time, largely because the previous book was written while I was… Continue reading Writing Relativity vs. Writing Quantum
How Do You See Interference Between Independent Lasers?
This is adapted from an answer to a question at the Physics Stack Exchange site. The questioner asked: It seems that if the coherence length of a laser is big enough, it is possible to observe a (moving) interference picture by combining them. Is it true? How fast should photo-detectors be for observing of the… Continue reading How Do You See Interference Between Independent Lasers?
Relativity on a Human Scale: “Optical Clocks and Relativity”
As mentioned in yesterday’s post on
Crowd-Source Your Physics Questions
There’s a new physics Q&A site from the folks at Stack Exchange, this one on physics. If you’re not familiar with the format, it’s a bulletin-board style site where you can post questions to be answered by other users, and people vote the answers up and down, so you can get a decent feel for… Continue reading Crowd-Source Your Physics Questions
How Do You Trap an Ion, Anyway?
One of the many physics stories I haven’t had time to blog about recently is the demonstration of relativistic time effects using atomic clocks. I did mention a DAMOP talk about the experiment, but the actual paper was published in Science (and is freely available from the NIST Time and Frequency Division (PDF file), because… Continue reading How Do You Trap an Ion, Anyway?
Academic Poll: Course Selection
We’ve just recently completed pre-registration for Winter term classes, so I’ve been thinking a bit about why students do and do not sign up for things. Thus, a poll: You are a college student considering an elective class in your major, and you see it has a lab. Your reaction is:survey software Feel free to… Continue reading Academic Poll: Course Selection
How to Teach Quantum Physics to Your Dog: Obsessive Update
I haven’t been doing these as regularly as I was earlier in the year, but here are a few interesting bits of news about How to Teach Physics to Your Dog: LA FISICA SPIEGATA AL MIO CANE, is now available. That’s the Italian edition, which Google translates to something like “Explaining Physics to My Dog.”… Continue reading How to Teach Quantum Physics to Your Dog: Obsessive Update
Physics Job Market: Same As It Ever Was
The American Institute of Physics has a statistics division that produces lots of interesting analyses of issues relevant to the discipline. A couple of them were released just recently, including one on the job status of new Ph.D.’s (PDF). The key graph from the report is this one: The text of the report talks up… Continue reading Physics Job Market: Same As It Ever Was
Massive Giveaway Winner(s)
Last week’s guess-the-number contest for my spare copy of Massive by Ian Sample generated over 150 comments. So, who won? Well, I said at the time: I am thinking of an integer between 0 and 1000 (inclusive). The person who comes closest to guessing the number by midnight Eastern time Friday, November 5 wins a… Continue reading Massive Giveaway Winner(s)