And Then, There Was Light

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What does this quote about the four dimensional divergence of an antisymmetric tensor mean? As most people know, "let there be light" is a famous biblical quote, from Genesis. Now, on to the teacher's shirt. Those equations on his back are Maxwell's equations.

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So, as a physicist, one could jokingly say that God's "let there be light" refers to him 'inventing' Maxwell's equations. Specifically, this tells us that it defines a wave with a speed of over the square root of the permeability times the permissivity of free space. Which is the speed of light: This equation is thus the equation of the electrical component for the speed of light: You can do exactly the same math for the magnetic field. So we have the equations for light, predicting the speed of light, that were, incidentally, formulated before the speed of light was measured, and predicted it.

Let there be light. By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered. Someone across the restaurant is wearing this shirt, and I certainly don't get it.

Those are the equations governing electromagnetism. Try it for 30 days FREE. Cancel at any time. You must be logged in to view your newly purchased content.

• TOKYO (3 a.m.).
• BibleGateway.
• electromagnetism - What is the meaning of this "let there be light" joke? - Physics Stack Exchange;

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