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Author Archives: David Prutchi

Bad Physics at the Equator – Shame on the Intiñan Solar Museum!

Posted on December 8, 2012 by David Prutchi Posted in Physics Humor, Uncategorized
Abigail Prutchi at the official "Mitad del Mundo" monument commemorating the 18th Century French Geodesic Mission marking of the Equator

Abigail Prutchi at the official “Mitad del Mundo” monument commemorating the 18th Century French Geodesic Mission marking of the Equator

Abigail and I just returned from a trip to the Galapagos Islands.  On the way, we visited the iconic Mitad del Mundo (Middle of the World) monument which commemorates the 18th-century French Geodesic Mission expedition carried out for the purpose of measuring the roundness of the Earth and measuring the length of a degree of latitude at the Equator.

The monument is constructed at the site where the Geodesic Mission calculated the passing of the Equator.  Modern measurements show that the Equator actually crosses about 240 meters north of the marked line.  Not bad at all for 18th-Century Physics, and an accomplishment worthy of the beautiful monument that commemorates it!

The Intiñan Solar Museum is a shameless tourist trap.  Tour guides get a kickback from the uscrupulous owners of this site where credulous turists are shown tricks that supposedly can happen only at the Equator.  This is prime wxample of Bad Physics fueled by greed!

The Intiñan Solar Museum is a shameless tourist trap. Tour guides get a kickback from the unscrupulous owners of this site where credulous tourists are shown tricks that supposedly can happen only at the Equator. This is a prime example of Bad Physics fueled by greed!

Recently however, a group of unscrupulous investors led by Mr. Humberto Vera started the Intiñan Solar Museum, which reportedly marks the true Equator.  Not true!

Tour guides take tourists there because the museum pays them a kickback (which the official Mitad del Mundo doesn’t).

Continue reading→

Article in SJ Voice: Father & Daughter Team Up to Make Science Accessible for Everyone

Posted on October 31, 2012 by David Prutchi Posted in Uncategorized

From today’s SJ Voice:

Article in SJ Voice Newspaper about David and Shanni Prutchi

Click here for the full article.

diyPhysics on Scientific American

Posted on October 22, 2012 by David Prutchi Posted in Uncategorized

Blog from Scientific American Magazine for diyPhisics David and Shanni Prutchi

George Musser – an editor at Scientific American (and author of “The Complete Idiot’s Guide to String Theory”) – visited our basement lab a few weeks ago.  Today he published a very nice blog about us on the Scientific American site.  Thanks George!

Click here for the blog.

Happy Quantum Halloween!

Posted on October 21, 2012 by David Prutchi Posted in Physics Humor


New Book by Prof. Mark Beck – Great Complement to Our diy Quantum Physics Book!

Posted on September 27, 2012 by David Prutchi Posted in Chapter 8 - Entanglement, Entangled-Photon Source, Single-Photon Counting Modules (SPCMs), Single-Photon Experiments, Uncategorized

Quantum Mechanics Theory and Experiment by Mark Beck, www.diyPhysics.comProf. Mark Beck from the Dept. of Physics at Whitman College recently published an excellent book titled “Quantum Mechanics: Theory and Experiment.”  It is written for an advanced undergraduate/graduate quantum mechanics class.  This book presents the theory in its full formalism (with thorough, high-level math), as well as describes five laboratory experiments that explore the use of entangled photons in the undergraduate lab.

Prof. Beck’s laboratory experiments use the same type of system as we describe in Chapter 8 of Exploring Quantum Physics Through Hands-On Projects, so if you are up to the math, we heartily recommend this book to continue your exploration with your entangled-photon system.

Continue reading→

Using the $79 SainSmart DSO201 Pocket Oscilloscope and GammaGrapher with the PMT/Scintillation Probe

Posted on September 21, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 3 - Atoms and Radioactvity, Chapter 5 - Wave-Particle Duality, Compton Scattering, MCA/PHA, Photomultipliers, PMT/Scintillation Processor, Scintillation Detector, Single-Photon Experiments

Connects directly to PMT probe shown in the book’s Figure 30 with no need for PMT amplifier!

 

Freeware Gamma Grapher MCA with diy PMT Scintillation Probe by David and Shanni Prutchi diyPhysics.com

The nice guys at the Yahoo GammaSpectrometry Group developed multichannel analyzer software for the $79 SainSmart DSO201 Pocket-Sized Digital Oscilloscope.  The upload of the MCA software to the oscilloscope is really easy (via USB), and it allows the PMT probe shown in the book’s Figure 30 to be connected directly to the oscilloscope’s input with no need for a PMT amplifier!

Continue reading→

A Low-Cost X-Band Generator for Microwave Optics Experiments

Posted on September 20, 2012 by David Prutchi Posted in Chapter 1 - Light as a Wave, Chapter 6 - The Uncertainty Principle, Chapter 7 - Schrödinger's Wave Equation, Doppler Effect, Gunnplexer Transceiver, Quantum Tunneling

Parallax X-Band Microwave Transmitter for diy Quantum Tunneling and Microwave Optics Experiments

Gunnplexers are becoming scarce in the surplus market, but X-band motion detection is very much alive.  X-band detection modules are available for OEM applications, and fortunatelly, Parallax has a unit based on this module available for $34.99.

Continue reading→

diy Quantum Physics on MAKE Magazine (Volume 31)

Posted on September 2, 2012 by David Prutchi Posted in Administrative, Book Chapters

diy Quantum Physics was featured in Make Magazine, Volume 31:  Punk Science (page 76).

diy Quantum Physics Book Featured in Philadelphia’s Exponent

Posted on August 23, 2012 by David Prutchi Posted in Uncategorized

 Shanni and David Prutchi featured in Philadelphia's Jewish Exponent

We were interviewed by the Jewish Exponent and featured in today’s edition.  Check it out at: http://www.jewishexponent.com/article/26460/FatherDaughter_CoAuthors/

A scan of the printed edition is at: Exponent002

A Number of Perkin Elmer SPCM AQRH 12 on eBay (No Connection to Seller)

Posted on August 7, 2012 by David Prutchi Posted in Uncategorized

My ongoing eBay search found a  number of Perkin Elmer SPCM AQRH-12 units.  Two are listed for $499 (buy-it-now) as working, one for $199 as “parts/repair.”  I have no connection to seller.

eBay auctions: 230835435238, 230835438679, and 320959423052 (parts/repair).

At Least a Billion Femto Angstroms

Posted on June 1, 2012 by David Prutchi Posted in Uncategorized


Tabletop Electron Accelerator Demonstrator at Trocadéro’s Gardens in Paris, France

Posted on June 1, 2012 by David Prutchi Posted in Uncategorized

Mini Electron Accelerator at Trocadero's Gardens in Paris. David Prutchi PhD, www.diyPhysics.com

Harvey Summers called my attention to a miniature electron accelerator that was built for an exhibit at the Trocadéro’s Gardens in Paris, France.  The device is an exhibit that was shown to the public for the first time during the CNRS exhibition “Entrée en matière” in November 2011.

Continue reading→

Two SPCMs on eBay at $400 Each (No Connection To Seller)

Posted on May 9, 2012 by David Prutchi Posted in Chapter 8 - Entanglement, Entanglement, Single-Photon Counting Modules (SPCMs), Single-Photon Experiments

SPCMs for sale on eBayToday I found two Perkin Elmer SPCM-AQE-13-FC SPCMs for sale on eBay at $400 each.  eBay auction numbers are 280877451350 and 280877453169.  I am passing along this information in case that blog readers may be interested.  I have no connection whatsoever to seller.

USA Science & Engineering Festival in Washington DC

Posted on April 29, 2012 by David Prutchi Posted in Administrative

Shanni Prutchi with Theo Gray, USA Science & Engineering Festival, Washington Dc, April 2012

We just came back from the USA Science & Engineering Festival in Washington DC, where we had the pleasure to meet fellow diy Science authors Theo Gray (Mad Science, The Elements, Popular Science’s Gray Matter, etc.) and William Gurstelle (Backyard Ballistics, Whoosh Boom Splat, The Practical Pyromaniac, etc.)

Shanni Prutchi with William Gurstelle at the USA Science & Engineering Festival, Washington DC, April 2012

Posted to www.prutchi.com: diy High-Power UV/IR/Visible Flashlight

Posted on April 27, 2012 by David Prutchi Posted in Ultraviolet Illuminators
diy High-power UV/IR/Visible flashlight by David Prutchi PhD www.diyPhysics.com
I just posted detailed instructions for the construction of a high-power (10W) flashlight that has interchangeable LED heads to produce UV, IR, or visible illumination.
The URL is http://www.prutchi.com/2012/04/27/d-i-y-high-power-swappable-head-uvirvisible-led-flashlight-with-intensity-control/#more-1091

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