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$\begingroup$ What do you mean by '...'? Just '.'? Do you have any references? Have you read en.wikipedia.org/wiki/Schwinger_limit ? $\endgroup$– my2ctsCommented Jul 3 at 9:57
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2$\begingroup$ How can it possibly matter what kind of units one uses? You can measure distance to galaxies in millimeters if you want: it doesn't change the distance. $\endgroup$– ZeroTheHeroCommented Jul 3 at 11:24
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2$\begingroup$ Let us calculate. Imagine a steady source of 1 MeV gamma rays. Your $1\ cm^2$ detector is seeing 1000 gamma rays per second. That's a flux of $10^9\ eV/s/cm^2$, or, in SI units, $1.6\ µW/m^2$. Multiply by the vacuum impedance (~377 Ω), take the square root, and get 25 mV/m. $\endgroup$– John DotyCommented Jul 3 at 11:29
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$\begingroup$ "Textbooks, sites and journals give estimates", "However, recent updates and news articles" Please provide the specific references and quotes therein. If not, at least consider providing links. Otherwise this just reeks of lack of basic effort. $\endgroup$– Vincent ThackerCommented Jul 5 at 10:41
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