फांसी से पहले निर्भया के दोषियों के 3 बड़े कानूनी पैंतरे, 3 मार्च को होनी है फांसी

पटियाला हाउस कोर्ट ने तीसरी बार डेथ वारंट जारी किया है, जिसके तहत निर्भया के दोषियों को 3 मार्च...

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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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