The half-life of carbon-14 is 5,730 years. This means that it takes 5730 years for a mass of carbon-14 to radioactively decay to half its mass...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answe...
Does carbon-14 go through beta or alpha decay? What is the rate of radioactive decay? The rate of decay for carbon-14 is -0.693 B and its half-life is 5,730 years. If an organism has 45% of its carbon-14 compared to the living sample, how old is the fossil?
与低碳完全相反,错误。 - **判断依据**: “Save energy”意为“节约能源”,即减少使用量;“produce carbon”涉及碳排放。低碳生活的核心是通过高效利用能源降低碳排放。选项B中“save more energy”表示减少能耗,“produce less carbon”对应减少排放,完全契合低碳定义。
---What’s the low-carbon(碳) life style like? ---Save energy, produce carbon. A. more; more B. less; more C. less; less D. more; less 相关知识点: 试题来源: 解析 D [解析] 试题分析:more更多的;less更少的。句意:低碳生活方式是什么样子?——节省更多的能源,产生更少的碳素。结合...
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
What are the half-lives of the following common isotopes: (a) Carbon - 14 (b) Uranium - 238 (c) Uranium - 235 The half-life of radioactive isotope: Half-life is the measurement of the rate of decay of radioactive materials. The half-life is the...
Answer to: Aproximately 9 half lives have passed, and too little carbon-14 remains in an object to be useful in dating the object. What is the...
【题文】 —What’s the low-carbon(低碳的) lifestyle like?—Save energy, and produce carbon. A. more; more B. less; more C. less; less D. more; less. 相关知识点: 试题来源: 解析 【答案】D. 【解析】试题分析:句意:--什么是低碳生活?--节约更多能源,制造更少的二氧化碳。more更多的...
句意:——低碳生活是什么样的?——产生更少的碳,节约更多能源。考查形容词比较级。fewer更少,修饰名词复数;less更少,修饰不可数名词;more更多,是much和many的比较级,可以修饰可数名词或者不可数名词;much很多,修饰不可数名词。carbon不可数名词,故排除A;根据两句的并列关系,第二空应该用比较级,故选C。
①The merchants of Arab are doing their things all of the world.(n.商人) ②He is a wholesale merchant.(n.批发商) ③This is a merchant ship of 5,000 tons.(adj.海上货运的) 2.negotiate vt.商定;达成(协议) vi.谈判;...