搜索 - 科创

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归零的沙漏和用过的电池这些东西肯定都会更轻的，只要你够闲，从E=mc2开始深挖，总能找到耗散的能量作为质量的藏身之处。下面的帖子解释了放电后的电池为什么更轻：https://physics.stack...

1. 我们都知道, 在场地受限的条件下架设天线最方便的方法之一是从窗口拉一根长线出来, 拴到对面的树上, 然后在地面上或者外墙上拉若干条工作频率四分之一波长长度的地网, 和良好的地线拧在一起, 用长线...

省流版结论：作为生活中最安全易得的同位素产品之一，氚管的辐射一直是无法绕开的话题，这次难得想起来，东西也都在手边，直接一探究竟。氚的β能谱，可以看到平均能量约5.7keV，最大能量约18.6keV，该...

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