A. The lifecycle of trees. B. The number of trees. C. The intensity of solar burning. D. The quality of air. 相关知识点: 试题来源: 解析 C[解析] 根据“During the sun's violent periods,…interfere with the formation of carbon-14 on earth.”可知影响地球上碳-14数量的因素是太阳风的强...
百度试题 结果1 题目What effects the amount of carbon-14 on earth() A. The life cycle of trees B. The number of trees C. The intensity of solar burning D. The quality of air 相关知识点: 试题来源: 解析 C 反馈 收藏
The Belt and Road Initiative is a creative development that takes on and carries forward the spirit of the ancient silk routes – two of the great achievements in human history and civilization. It enriches the ancient spirit with the zeitgeist and culture of the new era, and provides a platf...
百度试题 结果1 题目What is the atomic number of carbon? A. 6 B. 8 C. 12 D. 14 相关知识点: 试题来源: 解析 A。解析:碳的原子序数是6。选项B,8是氧的原子序数。选项C,12是碳的相对原子质量。选项D,14是硅的原子序数。反馈 收藏
KéréisacitizenofbothBurkinaFasoandGermanyandlivesinBerlin.OnTuesdayhesaidhe wasthe“happiestmanonthisplanet”tobecomethe51strecipientofthefamousyearlyprize.Kéré isfamedforbuildingschools,healthcenters,housing,andotherpublicspacesacrossAfrica.His buildingscanbefoundinhishomeland,aswellasinBenin,Mali,Kenya,Mozambi...
Kazoo has a simple structure. The flute is big at one end and small at the other. When playing, you should hold the big head in your mouth without blowing, but hum a tune with your throat. The vibration of the...
Carbon-14 is considered a "cosmogenic nuclide," meaning it forms when cosmic rays impact atoms, forcing nucleons (protons or neutrons) from them. Carbon-14 is created in the atmosphere out of nitrogen atoms.Answer and Explanation: Carbon-14 is a type of radiometric dating. Carbon-14 decays ...
The Hoyle state is an excited state of carbon-12, and it's really, really unstable. It's only found in very high-energy reactions, and it usually doesn't last very long.But occasionally, under the right conditions, the Hoyle state can exist for a really, really lon...
Radiocarbon dating is a method that provides objective age estimates for carbon-based materials that originated from living organisms. An age could be estimated by measuring the amount of carbon-14 present in the sample and comparing this against an inte
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