1.
(2024高二下·河北月考)
2023年9月15日,三星堆遗址考古入选世界重大田野考古发现。三星堆古遗址距今已有5000至3000年历史,昭示长江流域与黄河流域一样同属中华文明的母体。应用碳14测定年代是考古中的重要方法,在高空大气中,来自宇宙射线的中子轰击氮14,不断以一定的速率产生碳14,接着碳14就发生放射性衰变,其半衰期为5730年,反应方程分别为:
![](//math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E7%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3EN%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmo%3E%2B%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E0%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3En%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmo%3E%E2%86%92%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3EC%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmo%3E%2B%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3EH%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmn%3E%2C%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3EC%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmo%3E%E2%86%92%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E7%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3EN%3C%2Fmtext%3E%3Cmsubsup%3E%3Cmrow%3E%3Cmo%3E%2B%3C%2Fmo%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmo%3E%E2%88%92%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E0%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3Cmtext%3Ee%3C%2Fmtext%3E%3C%2Fmath%3E)
。以下说法中正确的是( )
![](//tikupic.21cnjy.com/2024/06/15/00/3a/003aa367515c392e970316123d5c18b1.png)
A . 核反应方程要遵循电荷数守恒和质量守恒
B . 碳14发生的放射性衰变是β衰变
C . 埋入地下的植物中,其碳14的半衰期将变长
D . 4个碳14原子核在经过一个半衰期后,一定还剩2个