Friday, November 17, 2017

Reviews of "The Quantum Labyrinth"

Paul Halpern's story of "when Feynman met Wheeler" in his book "The Quantum Labyrinth" has two interesting reviews that you can read (here and here). In the history of physics and human civilization, the meeting of the minds of these two giants in the world of physics must be rank up there with other partnerships, such as Lennon and McCartney, Hewlett and Packard, peanut butter and jelly, etc....

I have not read the book yet, and probably won't get to it till some time next year. But if you have read it, I'd like to hear what you think of it.

Zz.

Can A Simple Physics Error Cast Doubt On A da Vinci Paintaing?

It seems that the recent auction of a Leonardo da Vinci painting (for $450 million no less) has what everyone seems to call a physics flaw. It involves the crystal orb that is being held in the painting.

A major flaw in the painting — which is the only one of da Vinci's that remains in private hands — makes some historians think it's a fake. The crystal orb in the image doesn't distort light in the way that natural physics does, which would be an unusual error for da Vinci.

My reaction when I first read this is that, it is not as if da Vinci was painting this live with the actual Jesus Christ holding the orb. So either he made a mistake, or he knew what he was doing and didn't think it would matter. I don't think this observation is enough to call the painting a fake.

Still, it may make a good class example in Intro Physics optics.

Zz.

Saturday, November 11, 2017

Lorentz Gamma Factor

Don Lincoln has another video related to Relativity. This time, he's diving into more details on the Lorentz Gamma factor. At the beginning of the video, he's referring to another video he made on the misleading concept of relativistic mass, which I've linked to.



Zz.

Thursday, November 09, 2017

SLAC's LCLS Upgrade and What It Might Mean To You

Just in case you don't know what's going on at SLAC's LCLS, and the upcoming upgrade to bring it to LCLS-II, here's a CNET article meant for the general public to tell what what they have been up to, and what they hope to accomplish with the upgrade.

Keep in mind that LCLS is a "light source", albeit it is a very unique, highly-intense x-ray light source. SLAC is also part of the DOE's US National Laboratories, which include Brookhaven, Fermilab, Berkeley, Argonne, Los Alamos, .... etc.

Zz.

Friday, November 03, 2017

Muons, The Little Particles That Could

These muons are becoming the fashionable particles of the moment.

I mentioned at the beginning of this year (2017) of the use of muon tomography to image the damaged core at Fukushima. Now, muons are making headlines in two separate applications.

The first is the use of cosmic muons imaging that discovered hidden chambers inside Khufu's Pyramid at Giza. The second is more use of muons to probe the status of nuclear waste safely.

The comment I wrote in the first link still stands. We needed to know the fundamental properties of muons FIRST before we could actually use then to all these applications. And that fundamental knowledge came from high-energy/elementary particle physics.

So chalk this up to another application of such an esoteric field of study.

Zz.