महाराष्ट्र में 24 घंटे में शिवसेना ने पलटा गेम, BJP नहीं पवार बनेंगे किंगमेकर?

गुरुवार को शिवसेना नेता संजय राउत ने राष्ट्रवादी कांग्रेस के शरद पवार से मुलाकात की, जिसने सियासी गर्मी को...

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Readers ask about positronium, wild bees and more

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Dance of the doomed particles Scientists are puzzled by an unexpectedly large gap in the energy levels of an exotic “atom” called positronium, which consists of an electron and a positron, Emily Conover reported in “ Positronium result baffles physicists ” ( SN: 9/12/20, p. 14 ). Reader Lee Skinner asked why the electron and its antimatter counterpart, the positron, don’t just annihilate each other when they collide. Eventually, the electron and positron do annihilate one another, Conover says. As a result, positronium doesn’t stick around forever. “The two particles do a little orbital dance with each other for a period of time before they meet up and annihilate,” she says. “That’s actually part of how the researchers made the measurement, though I didn’t have the space to include those details in the story.” The team measured how long it took electrons and positrons to annihilate, which depends on the atoms’ energy level. “Timing that annihilation revealed whether the positr
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J-K: पुलवामा में एनकाउंटर, सुरक्षाबलों ने दो आतंकियों को घेरा

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जम्मू-कश्मीर के पुलवामा जिले के कामराजीपोरा में सेब के बागान में बुधवार सुबह करीब दो आतंकियों को सुरक्षाबलों ने घेर... from आज तक https://ift.tt/2FgLtOQ
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