{"fact":"Miacis, the primitive ancestor of cats, was a small, tree-living creature of the late Eocene period, some 45 to 50 million years ago.","length":133}
{"slip": { "id": 95, "advice": "Good advice is something a man gives when he is too old to set a bad example."}}
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{"type":"standard","title":"Pair production","displaytitle":"Pair production","namespace":{"id":0,"text":""},"wikibase_item":"Q115238","titles":{"canonical":"Pair_production","normalized":"Pair production","display":"Pair production"},"pageid":140858,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Light-matter_interaction_-_schematic.svg/320px-Light-matter_interaction_-_schematic.svg.png","width":320,"height":227},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/8/8e/Light-matter_interaction_-_schematic.svg/145px-Light-matter_interaction_-_schematic.svg.png","width":145,"height":103},"lang":"en","dir":"ltr","revision":"1291147554","tid":"1cbd5015-34a2-11f0-91fe-cfe2cb2982b6","timestamp":"2025-05-19T11:12:12Z","description":"Creation of particle-antiparticle pair from a neutral boson","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Pair_production","revisions":"https://en.wikipedia.org/wiki/Pair_production?action=history","edit":"https://en.wikipedia.org/wiki/Pair_production?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Pair_production"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Pair_production","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Pair_production","edit":"https://en.m.wikipedia.org/wiki/Pair_production?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Pair_production"}},"extract":"Pair production is the creation of a subatomic particle and its antiparticle from a neutral boson. Examples include creating an electron and a positron, a muon and an antimuon, or a proton and an antiproton. Pair production often refers specifically to a photon creating an electron–positron pair near a nucleus. As energy must be conserved, for pair production to occur, the incoming energy of the photon must be above a threshold of at least the total rest mass energy of the two particles created. Conservation of energy and momentum are the principal constraints on the process. \nAll other conserved quantum numbers of the produced particles must sum to zero – thus the created particles shall have opposite values of each other. For instance, if one particle has electric charge of +1 the other must have electric charge of −1, or if one particle has strangeness of +1 then another one must have strangeness of −1.","extract_html":"
Pair production is the creation of a subatomic particle and its antiparticle from a neutral boson. Examples include creating an electron and a positron, a muon and an antimuon, or a proton and an antiproton. Pair production often refers specifically to a photon creating an electron–positron pair near a nucleus. As energy must be conserved, for pair production to occur, the incoming energy of the photon must be above a threshold of at least the total rest mass energy of the two particles created. Conservation of energy and momentum are the principal constraints on the process. \nAll other conserved quantum numbers of the produced particles must sum to zero – thus the created particles shall have opposite values of each other. For instance, if one particle has electric charge of +1 the other must have electric charge of −1, or if one particle has strangeness of +1 then another one must have strangeness of −1.
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