मरकज के कार्यक्रम को समय पर रोक देते तो स्थिति न बिगड़तीः शाह
केंद्रीय गृह मंत्री अमित शाह ने कहा कि मरकज में सालभर ऐसे कार्यक्रम होते रहते हैं. वो कोई सार्वजनिक कार्यक्रम...from आज तक https://ift.tt/3cggAEP
Readers ask about positronium, wild bees and more
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
Comments
Post a Comment