退休教授

把『半衰期』讲成『活一半的时间』,是科普里最温柔的误导

【锚点】这一篇只钉一个判断:【半衰期】不是个体的【寿命】,而是大量随机事件的【统计比例】;科普若把它讲成“活一半”,会把概率改写成寿命。 【流程节点链路】单个原子随机衰变 → 大量原子的剩余比例按指数下降 → 定义 T1/2 为剩余量乘 1/2 的时间 → 每过一个 T1/2 再乘 1/2 → 听众若只记住“一半消失”,会误以为经过一个周期就安全/消失/危险减半。…

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