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Fermi postage stamp has an error

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By The Staff

Fermi postage stamp has an error

Dear Editor,

In the April 4 Monitor story about the visit of Enrico Fermi’s granddaughter to Los Alamos, a photo of Fermi in front of a blackboard was included with no caption.

There is an interesting story about that photo, which shows on the blackboard a geometrical figure and a formula. It was taken along with a few similar poses for publicity purposes, and one of those shots eventually appeared on a U.S. stamp at a time when firstclass postage was 34 cents. The stamp photo reveals only part of the formula, but enough to discern the error.

The truly remarkable aspect of the photo is that there is an error in the formula! It is a famous equation for a fundamental physics quantity called “the fine structure constant,” which describes the strength of the force between electrically charged particles and light. It has the approximate numerical value of 1/137, and is one of the most famous numbers in physics. The fine structure constantly appears on the left side of the equation and is represented by the Greek letter alpha.


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