torsdag 12 augusti 2021 kl. 22:47:02 UTC+2 skrev pva...@yahoo.com:
> Richard Feynman: "A very interesting example of the slowing of time with motion is furnished by muons, which are particles that disintegrate spontaneously after an average lifetime of 2×10^(−6) sec. They come to the earth in cosmic rays, and can also be produced artificially in the laboratory. Some of them disintegrate in midair, but the remainder disintegrate only after they encounter a piece of material and stop. It is clear that in its short lifetime a muon cannot travel, even at the speed of light, much more than 600 meters. But although the muons are created at the top of the atmosphere, some 10 kilometers up, yet they are actually found in a laboratory down here, in cosmic rays. How can that be? The answer is that different muons move at various speeds, some of which are very close to the speed of light. While from their own point of view they live only about 2 μsec, from our point of view they live considerably longer - enough longer that they may reach the earth." http://www.feynmanlectures.caltech.edu/I_15.html
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> Einsteinians call 2×10^(−6) sec "lifetime of muons at rest". Actually, this is the postcatastrophic lifetime of muons that have crashed into the detector at a speed close to the speed of light and naturally disintegrate faster than muons in flight (similarly, the postcatastrophic lifetime of car drivers "at rest" is shorter than the lifetime of drivers in motion):
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> "The lifetime of muons at rest [...] Some of these muons are stopped within the plastic of the detector and the electronics are designed to measure the time between their arrival and their subsequent decay. The amount of time that a muon existed before it reached the detector had no effect on how long it continued to live once it entered the detector. Therefore, the decay times measured by the detector gave an accurate value of the muon's lifetime. After two kinds of noise were subtracted from the data, the results from three data sets yielded an average lifetime of 2.07x 10^(-6)s, in good agreement with the accepted value of 2.20x 10^(-6)s." http://cosmic.lbl.gov/more/SeanFottrell.pdf
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> "In order to measure the decay constant for a muon at rest (or the corresponding mean-life) one must stop and detect a muon, wait for and detect its decay products, and measure the time interval between capture and decay. Since muons decaying at rest are selected, it is the proper lifetime that is measured. Lifetimes of muons in flight are time-dilated (velocity dependent), and can be much longer..." https://www.scribd.com/document/266379869/Muon-Rutgers
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> See more here: https://twitter.com/pentcho_valev
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> Pentcho Valev
you're still wrong