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双电容器法是较为精确地测定电子荷质比 ｅｍ的现代测量方法之一 ,一道最新物理竞赛题介绍了这种方法 .测定电子荷质比 ｅｍ的最精确的现代方法之一是双电容器法 ,如图 1所示 .在真空管中由阴极Ｋ发射出的电子 ,其初速度可忽略不计 ,此电子被阳极Ａ的电场加速后穿过屏障Ｄ1上的
The double-capacitor method is one of the most modern methods for measuring the electron-to-electron-to-emitter ratio more precisely. A recent physics contest describes this method. One of the most accurate modern methods for determining the electron-to-electron-mass ratio is the double-capacitor method. As shown in Figure 1, the electrons emitted from the cathode K in the vacuum tube have negligible initial velocity. This electron is accelerated by the electric field of the anode A and passes through the barrier D1.